Titular Sees
(78 Metropolitan, 85 Archiepiscopal,
843 Episcopal) | Vacant
since | Last Titular Bishop |
| Abila in Palæstina | 1977.02.24 | Cardinal Paulos Tzadua (transferred) |
| Abydus | 2006.11.11 |  Archbishop Michel Abrass (72) (transferred) |
| Achelous | 1976.10.28 | Bishop Owen Noel Snedden (transferred) |
| Achyraus | 1990.08.11 | Bishop Augustín Van Aaken, S.V.D. (died) |
| Acilisene | 1972.09.20 | Bishop Cirillo Giovanni Zohrabian, O.F.M. Cap. (died) |
| Acmonia | 1962.04.02 | Archbishop Gilbert Ramanantoanina, S.J. (transferred) |
| Acrassus | 2018.12.06 |  Bishop Djura Džudžar (67) (transferred) |
| Acrida | 1997.04.19 | Cardinal Varkey Vithayathil, C.SS.R. (transferred) |
| Adada | 1977.12.20 | Bishop Conrad Dubbelman, O. Praem. (died) |
| Adana | 1981.07.20 | Archbishop Diego Venini (died) |
| Adana (Armenian Rite) | 2021.02.15 | Archbishop Neshan Elijah Karakéhéyan, I.C.P.B. (died) |
| Adana (Greek-Melkite Rite) | 2015.12.23 | Archbishop Grégoire Haddad (died) |
| Adraa | 1964.04.21 | Bishop Elias Mchonde (transferred) |
| Adramyttium | 1966.02.01 | Bishop Nicola Agnozzi, O.F.M. Conv. (transferred) |
| Adrasus | 1970.04.16 | Bishop Norman Joseph Gallagher (transferred) |
| Adulis | 1969.03.03 | Archbishop Martin Lucas, S.V.D. (died) |
| Aëtus | 1966.10.11 | Bishop Johannes Willem Maria Bluijssen (transferred) |
| Ægæ | 1978.05.26 | Bishop Cornélio Chizzini, F.D.P. (resigned) |
| Agathonice | 1993.02.01 | Bishop William Brasseur, C.I.C.M. (died) |
| Agathopolis | 2008.08.26 | Bishop Michael Kuchmiak, C.SS.R. (died) |
| Agbia | 2020.11.25 | Bishop Uriah Adolphus Ashley Maclean (died) |
| Ægeæ | 1967.01.31 | Bishop José Joaquim Ribeiro (transferred) |
| Ægina | 1990.09.29 | Archbishop Raffaele Forni (died) |
| Agnus | 1963.12.17 | Bishop Michel-Louis Vial (transferred) |
| Æla | 1978.11.27 | Cardinal Joseph-Marie Trịnh Văn Căn (transferred) |
| Alabanda | 1968.05.02 | Bishop James William Malone (transferred) |
| Alexandria minor | 1964.06.04 | Bishop Daniel Tavares Baeta Neves (transferred) |
| Algiza | 1995.12.09 | Archbishop Mario Brini (died) |
| Alia | 1971.12.01 | Bishop Lech Kaczmarek (transferred) |
| Alinda | 1982.06.06 | Bishop Juan Hervás y Benet (died) |
| Alphocranon | 1933 | |
| Amadassa | 1970.03.15 | Bishop François-Xavier Lacoursière, M. Afr. (died) |
| Amasea | 1995.01.14 | Archbishop James Patrick Carroll (died) |
| Amastris | 1965.04.06 | Archbishop Teopisto Valderrama Alberto (transferred) |
| Amathus in Cypro | 1984.01.14 | Bishop Garabed Amadouni (died) |
| Amathus in Palæstina | 1967.12.23 | Bishop Hugo Mark Gerbermann, M.M. (transferred) |
| Amblada | 1967.12.02 | Bishop Eldon Bernard Mathias Schuster (transferred) |
| Amida (Syriac Rite) | 1989.11.30 | Archbishop Flavien Zacharie Melki (died) |
| Amisus | 1978.02.18 | Bishop Cornelius de Wit, M.H.M. (resigned) |
| Ammoniace | 1983.01.24 | Bishop Luis María Blas Maestu Ojanguren, O.F.M. (died) |
| Amorium | 1970.08.05 | Archbishop Giovanni C. Luigi Marinoni, O.F.M. Cap. (died) |
| Amphipolis | 1981.04.20 | Bishop Edward Vincent Dargin (died) |
| Amyzon | 1980.01.12 | Bishop Antonin Fishta, O.F.M. (died) |
| Anæa | 1984.08.14 | Bishop Giovanni Picco (died) |
| Anasartha | 1969.11.02 | Archbishop Serafim Gomes Jardim da Silva (died) |
| Anastasiopolis | 1970.12.20 | Bishop Roberto Benardino Berríos Gaínza, O.F.M. (resigned) |
| Anatetarte | 1933 | |
| Anazarbus | 1964.07.31 | Archbishop Joseph-Marie Le Gouaze (died) |
| Anchialus | 1965.09.26 | Archbishop Giacinto Giovanni Ambrosi, O.F.M. Cap. (died) |
| Ancyra | 1976.05.24 | Cardinal Opilio Rossi (transferred) |
| Ancyra (Armenian Rite) | 2002.09.09 | Bishop Mikail Nersès Sétian (died) |
| Ancyra ferrea | 1933 | |
| Andeda | 1997.04.18 | Bishop Vincent-Marie Favé (died) |
| Andrapa | 1966.12.09 | Archbishop John Francis Whealon (transferred) |
| Anemurium | 1966.06.18 | Bishop Ottone Raible, S.A.C. (died) |
| Anineta | 1973.02.16 | Bishop Paweł Latusek (died) |
| Antandrus | 1966.12.30 | Bishop Léon-Arthur-Auguste Elchinger (transferred) |
| Antæopolis | 1978.11.09 | Bishop Ubaldo Teofano Stella, O.C.D. (died) |
| Anthedon | 1965.02.24 | Bishop Felix Roeder (died) |
| Antinoë | 1999.12.18 | Cardinal Varkey Vithayathil, C.SS.R. (transferred) |
| Antiochia ad Mæandrum | 1973.03.11 | Bishop Edward Louis Fedders, M.M. (died) |
| Antiochia in Pisidia | 1976.05.24 | Cardinal Corrado Bafile (transferred) |
| Antiochia parva | 1964.04.11 | Bishop André-Jean-Marie Charles de la Brousse (transferred) |
| Antipatris | 1951.04.03 | Bishop Francis Liu Jin-wen (Liu Chiu-wen) (劉錦文) (died) |
| Antiphellus | 1967.08.28 | Bishop Jean-Marie Aubin, S.M. (died) |
| Antiphræ | 1965.09.15 | Archbishop John Joseph Maguire (transferred) |
| Antipyrgos | 1969.03.06 | Bishop Myles McKeon (transferred) |
| Ænus | 1971.06.06 | Archbishop Louis Morel (穆清海), C.I.C.M. (died) |
| Apamea Cibotus | 1975.06.13 | Bishop Eustace John Smith, O.F.M. (died) |
| Apamea in Bithynia | 1975.12.12 | Archbishop David Mathew (died) |
| Apamea in Syria | 1974.02.28 | Archbishop Eris Norman Michael O’Brien (died) |
| Apamea in Syria (Syriac Rite) | 1982.08.11 | Archbishop Clément Ignace Mansourati (died) |
| Aperlæ | 1967.03.12 | Bishop Felicissimus Alphonse Raeymaeckers, O.F.M. Cap. (transferred) |
| Aphnæum | 1997.04.15 | Bishop Gregorio Espiga e Infante, O.A.R. (died) |
| Aphroditopolis | ? | |
| Apollonia Salbace | 1933 | |
| Apollonias | 1968.02.09 | Bishop Enrico Petrilli (died) |
| Apollonis | 2009.04.16 | Bishop Michel Louis Marie Joseph Mondésert (died) |
| Apollonopolis magna | 1933 | |
| Apollonopolis parva | 1933 | |
| Apollonos-Hieron | 1933 | |
| Appia | 1982.12.17 | Bishop Athanasios Abadir (transferred) |
| Aprus | 1968.04.23 | Archbishop Antonio Gregorio Vuccino, A.A. (died) |
| Aquæ Sirenses | 2021.05.27 | Bishop Heinrich Janssen (died) |
| Aræ in Mauretania | 2021.03.10 | Bishop Jesús Ruiz Molina, M.C.C.J. (62) (transferred) |
| Arabia | 1933 | |
| Arabissus | 1973.04.27 | Bishop Peter Francis Rayappa (died) |
| Arad | 1969.04.25 | Bishop Vicente Roig y Villalba, O.F.M. Cap. (transferred) |
| Araxa | 1989.04.13 | Bishop Philip Joseph Furlong (died) |
| Arca in Armenia | 1987.12.03 | Bishop Salvador Martinez Aguirre, S.J. (died) |
| Arca in Phœnicia | 1981.01.17 | Bishop Hugo Aufderbeck (died) |
| Arcadia | 1965.01.17 | Bishop Giuseppe Almici (transferred) |
| Arcadiopolis in Asi | 1977.09.20 |  Bishop Basil Harry Losten (91) (transferred) |
| Arcadiopolis in Europa | 1968.10.24 | Archbishop Auguste-Siméon Colas, M.E.P. (died) |
| Archelaïs | 1968.06.09 | Bishop Antonio María Michelato Danese, O.S.M. (died) |
| Ardamerium | 1933 | |
| Areopolis | 1965.05.09 | Bishop René-Noël-Joseph Kérautret (transferred) |
| Arethusa | 1962.02.28 | Bishop Charles-Marie-Jacques Guilhem (transferred) |
| Argos | 1954.08.11 | Bishop Bernardo Gerardo Hilhorst, C.S.Sp. (died) |
| Ariarathia | ? | |
| Ariassus | 1968.04.26 | Bishop Ignacio María de Orbegozo y Goicoechea (transferred) |
| Aristium | 1945.05 | Bishop Josip Marija Carevic (died) |
| Arneæ | 1970.10.13 | Bishop Patrice Flynn (died) |
| Arsinoë in Arcadia | 1999.05.23 | Bishop Jerônimo Mazzarotto (died) |
| Arsinoë in Cypro | 2012.06.26 | Bishop Angelo Cuniberti, I.M.C. (died) |
| Artvin (Armenian Rite) | 1972 | |
| Arycanda | 2001.02.15 | Bishop Benito Epifanio Rodríguez (died) |
| Ascalon | 1966.06.21 | Archbishop Paul-Laurent-Jean-Louis Mazé, SS.CC. (transferred) |
| Aspendus | 1967.07.13 | Bishop John Fergus O’Grady, O.M.I. (transferred) |
| Aspona | 1978.08.12 | Bishop Carlo Re, I.M.C. (died) |
| Assus | 1995.10.09 | Bishop Zygfryd Wincenty Kowalski (died) |
| Astypalæa | 1980.04.24 | Bishop James Buis, M.H.M. (died) |
| Atenia | 1989.05.29 | Bishop Gauthier Pierre Georges Antoine Dubois, O.F.M. Cap. (died) |
| Athribis | 1968.05.24 | Bishop Henryk Grzondziel (died) |
| Athyra | 1964.11.25 | Bishop Louis Nganga a Ndzando (transferred) |
| Attæa | 1967.03.10 | Bishop Vitale Bonifacio Bertoli, O.F.M. (died) |
| Attalea in Lydia | ? | Bishop Carlo Maria Giuseppe de Fornari (resigned) |
| Attalea in Pamphylia | 1966.06.21 | Archbishop George Hamilton Pearce, S.M. (transferred) |
| Attanasus | 1964.07.07 | Cardinal Joseph Albert Malula (transferred) |
| Attuda | 1964.06.22 | Archbishop Antônio Ferreira de Macedo, C.SS.R. (transferred) |
| Augusta | 1979.05.12 | Bishop Antonio Rocca (died) |
| Augustopolis in Palæstina | 1933 | |
| Augustopolis in Phrygia | 1968.06.11 | Bishop Justin Abraham Najmy, B.A. (died) |
| Aulon | 1998.07.28 | Bishop Manuel Augusto Cárdenas (died) |
| Aureliopolis in Asia | 1968.04.06 | Bishop Alfonso Uribe Jaramillo (transferred) |
| Aureliopolis in Lydia | 2004.12.30 | Archbishop Salvatore Asta (died) |
| Aurocla | 1933 | |
| Axomis | 1967.12.02 | Bishop Joseph Bernard Brunini (transferred) |
| Æzani | 1969 | Bishop Marcello Rosina (transferred) |
| Azotus | 1953.08.19 | Bishop Gyözö Simon Macalik (died) |
| Babylon | 1933 | |
| Bacatha in Arabia | 1933 | |
| Bacatha in Palestina | 1933 | |
| Balanea | 1994.12.09 | Bishop Edward Francis Joseph Schlotterback, O.S.F.S. (died) |
| Balbura | 1969.03.06 | Bishop Placidus Gervasius Nkalanga, O.S.B. (transferred) |
| Barata | 1975.01.07 | Bishop Mihály Endrey-Eipel (transferred) |
| Barbalissus | 1969.01.30 | Bishop Thomas James Wade, S.M. (died) |
| Barca | 2003.03.21 | Bishop Andraos Salama (transferred) |
| Barcusus | 1996.12.16 | Bishop Lawrence Ephraem Thottam (transferred) |
| Bareta | 2013.01.18 |  Bishop Hlib Borys Sviatoslav Lonchyna, M.S.U. (67) (transferred) |
| Bargala | 1959.05.07 | Bishop Joseph-Jean-Yves Marcadé (died) |
| Bargylia | 1963.08.13 | Bishop Jean-Ghislain Delcuve, O.F.M. Cap. (died) |
| Baris in Hellesponto | 1990.11.22 | Bishop Walenty Wójcik (died) |
| Baris in Pisidia | 1967.01.10 | Bishop António Cardoso Cunha (transferred) |
| Basilinopolis | 1973.09.18 | Bishop Alexandre Poncet, S.M. (died) |
| Batnæ | 1974.07.11 | Bishop Simeon Kokov (Kokoff), O.F.M. Cap. (died) |
| Baza | 2021.05.11 | Bishop Joseba Segura Etxezarraga (63) (transferred) |
| Belabitene | 1966.11.15 | Archbishop George Elmer Bernarding, S.V.D. (transferred) |
| Berenice | 1968.10.27 | Bishop Antonius Hofmann (transferred) |
| Berissa | 1966.11.15 | Archbishop Herman Tillemans, M.S.C. (transferred) |
| Berœa | 1974.07.16 | Archbishop Domenico Picchinenna (transferred) |
| Beroë | 2000.10.13 | Archbishop Victor Sartre, S.J. (died) |
| Berrhœa | 1993.09.26 | Bishop Federico Kaiser Depel, M.S.C. (died) |
| Bethlehem | 1987.07.17 | Bishop Lois-Séverin Haller, C.R.A. (died) |
| Binda | 2003.07.03 | Archbishop Gaetano Alibrandi (died) |
| Birtha | 1977.11.03 | Bishop Carlos Arturo Mullín Nocetti, S.J. (transferred) |
| Bitylius | 1981.11.09 | Archbishop Marcelo Pinto Carvalheira (transferred) |
| Bizya | 1970.12.10 | Archbishop Frédéric Edouard Camille Lamy (resigned) |
| Blaundus | 1971.01.31 | Bishop Victor-Jean Perrin (died) |
| Bonitza | 1984.12.18 | Bishop Tadeusz Etter (died) |
| Boreum | 1990.05.04 | Bishop Sinforiano Lucas Rojo, O.M.I. (died) |
| Bosana | 1992.04.23 | Bishop Vincentas Brizgys (died) |
| Bosporus | 1965.01.17 | Cardinal Jean-Marie Villot (transferred) |
| Bostra | 1975.02.27 | Archbishop Iwannis Georges Stété (died) |
| Botrys | 1967.06.12 | Bishop Edward Wilson Douglas (died) |
| Bria | 1996.06.15 | Bishop John James Ward (transferred) |
| Briula | 2019.10.11 | Bishop Christo Proykov (75) (transferred) |
| Bruzus | 1969.08.20 | Archbishop Josip Pavlišić (transferred) |
| Brysis | 1967.11.05 | Archbishop Pedro Maria Rodríguez Andrade (died) |
| Bubastis | 1978.05.26 | Bishop Camillo Faresin, S.D.B. (resigned) |
| Bubon | 1933 | |
| Bucellus | 1993.04.20 | Bishop Mykhajlo Sabryha, C.SS.R. (transferred) |
| Buleliana | 2021.01.16 | Bishop John Đỗ Văn Ngân (68) (transferred) |
| Bulgarophygum | 1933 | |
| Butus | 1977.06.27 | Cardinal František Tomášek (transferred) |
| Byblus | 2016.12.17 | Archbishop Edmond Y. Farhat (died) |
| Cadi | 2009.09.21 | Archbishop Miroslav Stefan Marusyn (died) |
| Cadossia | 2000.08.03 | Bishop Antoon Demets, C.SS.R. (died) |
| Caffa | 1978.03.10 | Bishop Efraím Basílio Krevey, O.S.B.M. (transferred) |
| Callipolis | 1992.06.16 | Bishop Bernard Schilling, S.V.D. (died) |
| Calœ | 1970.06.26 | Bishop Matteo Aloisio Niedhammer y Yaeckle, O.F.M. Cap. (died) |
| Calydon | 1973.12.14 | Bishop Johannes Baptist Neuhäusler (died) |
| Calynda | 1971.06.04 | Bishop Warren Louis Boudreaux (transferred) |
| Camachus | 1974.10.30 | Archbishop Mesrop Habozian (died) |
| Campania | 1965.06.12 | Bishop Jorge Carlos Carreras (transferred) |
| Camuliana | 1970.06.13 | Bishop Piotr Dudziec (died) |
| Cana | 1970.11.25 | Patriarch Giacomo Giuseppe Beltritti (transferred) |
| Canatha | 2017.06.17 | Bishop Maroun Ammar (65) (transferred) |
| Candyba | 1966.10.20 | Bishop Gerald Francis O’Keefe (transferred) |
| Capitolias | 1992.04.23 | Bishop José Thurler (died) |
| Carallia | 1981.01.17 | Archbishop Louis Joseph Cabana, M. Afr. (died) |
| Cardabuntha | 1933 | |
| Cardicium | 1969.04.25 | Bishop Eloy Tato Losada, I.E.M.E. (97) (transferred) |
| Carpasia | 1965.02.22 | Cardinal Enrico Dante (transferred) |
| Carpathus | 1979.01.15 | Archbishop Jean-Baptiste Urrutia, M.E.P. (died) |
| Carrhæ | 1965.03.27 | Bishop Joseph Louis André Ouellette (transferred) |
| Carthage | 1979.06.30 | Cardinal Agostino Casaroli (transferred) |
| Carystus | 1966.04.21 | Bishop Johannes Lenhardt (died) |
| Casæ in Pamphylia | 1997.11.07 | Bishop Mychajlo Koltun, C.SS.R. (72) (transferred) |
| Cæsaropolis | 1990.03.14 | Cardinal Alexandru Todea (transferred) |
| Casius | 1966.01.15 | Bishop Renatus Lwamosa Butibubage (transferred) |
| Cassandria | 1987.07.25 | Bishop Georges-Stanislas-Jean Béjot (died) |
| Castoria | 1971.04.22 | Bishop Stanislas Courbe (died) |
| Castulo | 2021.06.12 | Bishop Víctor Alejandro Aguilar Ledesma (56) (transferred) |
| Caunas | 1972.09.17 | Bishop Angelo Barbisotti, F.S.C.J. (died) |
| Cea | 1966.03.04 | Bishop Lawrence Bernard Brennan Casey (transferred) |
| Celano | 2009.01 | |
| Celenderis | 1964.02.14 | Bishop Petras Mazelis (transferred) |
| Cephas | 1974.05.05 | Archbishop Kuriakose Kunnacherry (transferred) |
| Cerasa | 2001.05.02 | Bishop Réginald-André-Paulin-Edmond Jacq, O.P. (died) |
| Cerasus | 1965.03.21 | Archbishop Arturo Antonio Szymanski Ramírez (transferred) |
| Ceretapa | 1933 | |
| Cernitza | 1973.02.01 | Bishop Fidel Mario Tubino Mongilardi (died) |
| Cerynia | 1976.12.29 | Bishop Joseph Zimmermann (died) |
| Cesarea in Bithynia | 1982.01.05 | Bishop Secondo Chiocca (died) |
| Cesarea in Cappadocia | 1973.03.05 | Cardinal Pietro Palazzini (transferred) |
| Cesarea in Cappadocia (Greek-Melkite Rite) | 1984.09.01 | Archbishop Michel Hakim (resigned) |
| Cesarea in Palæstina | 1967.06.26 | Cardinal Dino Staffa (transferred) |
| Cesarea in Palæstina (Greek-Melkite Rite) | 2017.01.01 | Archbishop Hilarion Capucci, B.A. (died) |
| Cesarea in Thessalia | 1980.10.27 | Bishop Paolo Savino (died) |
| Cestrus | 1967.04.28 | Bishop Edoardo Bresson, S.M. (died) |
| Chalcedon | 1967.06.26 | Cardinal Angelo Dell’Acqua, O.Ss.C.A. (transferred) |
| Chalcedon (Syriac Rite) | 1941.06.14 | Archbishop Paul Auad (transferred) |
| Chalcis in Europa | 1933 | |
| Chalcis in Græcia | 1966.11.26 | Bishop Gallus Steiger, O.S.B. (died) |
| Chalcis in Syria | 1968.09.19 | Archbishop Antônio Maria Alves de Siqueira (transferred) |
| Charac-Moba | 1933 | |
| Chariopolis | 1970.09.11 | Bishop Timoteo Giorgio Raymundos, O.F.M. Cap. (died) |
| Chersonesus in Creta | 1989.12.21 | Archbishop Karel Otčenášek (transferred) |
| Chersonesus in Europa | 1965.12.04 | Archbishop Felipe Santiago Benítez Avalos (transferred) |
| Chersonesus in Zechia | 1976.07.03 | Patriarch Hemaiag Bédros XVII Guédiguian (Hemaiagh Guédiguian, C.A.M.) (resigned) |
| Chiemsee | 2009.01 | |
| Choma | 1978.09.22 | Bishop Joseph Arthur Costello (died) |
| Chonochora | 1996.11.11 | Bishop Joseph Khoury (transferred) |
| Christianopolis | 1974.02.02 | Bishop Imre Kisberk (transferred) |
| Christopolis | 1984.03.31 | Archbishop Sante Portalupi (died) |
| Chrysopolis in Arabia | 1935.02.07 | Bishop Pierre-Jean-Marie Gendreau, M.E.P. (died) |
| Chrysopolis in Macedonia | 1987.12.27 | Bishop Florencio Sanz Esparza, C.M. (died) |
| Chytri | 1966.05.20 | Bishop Miguel Nóvoa Fuente (died) |
| Cibaliana | 2021.05.01 | Bishop Geraldo Dantas de Andrade, S.C.I. (died) |
| Cibyra | 1965.07.06 | Archbishop Clemens P. Chabukasansha (transferred) |
| Cidramus | 1970.03.31 | Bishop Anastasio Granados García (transferred) |
| Cidyessus | 1965.12.18 | Bishop Claude-Philippe Bayet, M.E.P. (transferred) |
| Cinna | 1968.10.29 | Bishop Matteo Múgica y Urrestarazu (died) |
| Cinnaborium | 1933 | |
| Ciparissia | 1969.04.26 | Bishop Gregorio Garavito Jiménez, S.M.M. (transferred) |
| Circesium | 1980.11.24 | Bishop Giovanni Gazza (transferred) |
| Cisamus | 1994.05.25 | Bishop Nikollë Troshani (died) |
| Ciscissus | 1933 | |
| Citharizum | 1971.04.30 | Bishop Pio Alberto Fariña Fariña (died) |
| Citrus | 1965.07.09 | Bishop Adolph Marx (transferred) |
| Cius | 1964.03.11 | Archbishop Martin Michael Johnson (transferred) |
| Claneus | 1968.01.31 | Bishop George Henry Speltz (transferred) |
| Claudiopolis in Honoriade | 2000.03.26 | Archbishop Alfredo Bruniera (died) |
| Claudiopolis in Isauria | 1969.06.14 | Archbishop Emanuele Clarizio (transferred) |
| Clazomenæ | 1966.08.26 | Bishop Robert Stephen Dehler, C.R. (died) |
| Cleopatris | 1985.06.28 | Bishop Youhanna Kabès (died) |
| Clysma | 1991.06.05 | Bishop Wladyslaw Jedruszuk (transferred) |
| Cnidus | 1973.06.29 | Bishop Jan Vos, M.H.M. (died) |
| Cnossus | 1970.11.27 | Bishop Georges-Léon Landry (resigned) |
| Codaca | 1933 | |
| Codrula | 1933 | |
| Cœla | 1980.06.03 | Bishop João Batista Marchesi, S.D.B. (died) |
| Colbasa | 1964.07.05 | Bishop Pasquale Bacile (transferred) |
| Colonia in Armenia | 1983.06.27 | Archbishop Paul Coussa (transferred) |
| Colonia in Cappadocia | 1970.12.10 | Bishop Xavier Morilleau (resigned) |
| Colophon | 1973.08.27 | Bishop Juan Solá y Farrell, O.F.M. Cap. (died) |
| Colossæ | 1965.02.22 | Cardinal Cesare Zerba (transferred) |
| Colybrassus | 1974.02.24 | Bishop José del Perpetuo Socorro Alvarez Mácua, O.A.R. (died) |
| Comama | 1894.01.30 | Bishop Jean-Baptiste Chausse, S.M.A. (died) |
| Comana Armeniæ | 2010.04.13 | Bishop André Bedoglouyan, I.C.P.B. (died) |
| Comana pontica | 1969.01.31 | Bishop Vicente Felicísimo Maya Guzmán (transferred) |
| Comba | 1984.12.18 | Bishop Tarcisius Henricus Josephus van Valenberg, O.F.M. Cap. (died) |
| Conana | 1966.11.15 | Bishop Firmin Martin Schmidt, O.F.M. Cap. (transferred) |
| Cone | 1968.05.29 | Bishop Clarence Edward Elwell (transferred) |
| Constantia in Arabia | 1969.02.03 | Bishop Oscar Joseph Joliet (died) |
| Constantia in Scythia | 1965.08.15 | Archbishop Vito Roberti (transferred) |
| Constantia in Thracia | 1963.07.16 | Cardinal Pierre Veuillot (transferred) |
| Constantina | 1979.04.20 | Bishop Josef Hiltl (died) |
| Coprithis | 1933 | |
| Coptus | 1967.02.17 | Bishop Luis Alfredo Carvajal Rosales (transferred) |
| Coracesium | 1970.06.22 | Bishop Julián Luis Barni Spotti, O.F.M. (transferred) |
| Corada | 1994.11.12 | Bishop Augustinus Frotz (died) |
| Corinthus | 2005.11.17 | Archbishop Gennaro Verolino (died) |
| Corna | 1969.12.12 | Bishop Mattia Leonardo Trudone Brans, O.F.M. Cap. (died) |
| Corone | 1971.09.23 | Bishop Ildefonso Rea, O.S.B. Cas. (died) |
| Coronea | 1967.08.04 | Archbishop Milton Corrêa Pereira (transferred) |
| Coropissus | 1991.12.16 | Bishop Argimiro Alvaro García Rodríguez, O.F.M. Cap. (died) |
| Corycus | 1967.10.27 | Bishop Francesco Salis-Seewis (died) |
| Corydala | 1965.08.18 | Bishop Henry Joseph Thünemann, O.S.F.S. (died) |
| Cos | 2004.06.30 | Bishop Paul Heinrich Nordhues (died) |
| Cotenna | 1986.03.20 | Bishop John Joseph Dougherty (died) |
| Cotrada | 1969.04.27 | Archbishop Antonio José Jaramillo Tobón (died) |
| Cotyæum | 1964.03.19 | Archbishop Daniel James Gercke (died) |
| Cratia | 1985.01.20 | Bishop Camilo Plácido Crous y Salichs, O.F.M. Cap. (died) |
| Cremna | 1967.07.09 | Bishop Belchior Joaquim da Silva Neto, C.M. (transferred) |
| Cucusus | 1981.03.22 | Bishop Constantino Gómez Villa, O.F.M. Cap. (died) |
| Curium | 1984.08.21 | Bishop Edward Joseph Maginn (died) |
| Cusæ | 1982.05.13 | Bishop Joseph Anthony Ferrario (transferred) |
| Cyanæ | 1982.11.01 | Bishop Vitus Zhang Zuo-heng (Chang Tso-huan) (張作恆), S.V.D. (died) |
| Cybistra | 1965.02.03 | Bishop Nicasio Balisa y Melero, O.A.R. (died) |
| Cyme | 1994.02.09 | Bishop Urbain-Marie Person, O.F.M. Cap. (died) |
| Cynopolis in Ægypto | 1970.12.07 | Bishop Joseph Gerald Holland, S.M.A. (resigned) |
| Cynopolis in Arcadia | 1968.04.10 | Bishop Jean-Marcel Rodié (died) |
| Cypsela | 1969.04.20 | Archbishop Johannes Petrus Huibers (died) |
| Cyrene | 1983.02.19 | Bishop Valérien Bélanger (died) |
| Cyrrhus | 1966.11.22 | Archbishop José Rafael Pulido Méndez (transferred) |
| Cyzicus | 1974.11.23 | Archbishop Manuel Marilla Ferreira da Silva (died) |
| Dadima | 1981.01.30 | Bishop József Winkler (died) |
| Dadybra | 1933 | |
| Daldis | 1977.05.06 | Bishop Henry Theophilus Klonowski (died) |
| Dalisandus in Isauria | 1964.02.07 | Bishop Laureano Castán Lacoma (transferred) |
| Dalisandus in Pamphylia | 2007.06.24 | Bishop Rudolf Johannes Maria Koppmann, O.M.I. (died) |
| Damascus | 1967.06.26 | Cardinal Giuseppe Beltrami (transferred) |
| Danaba | 1964.09.01 | Archbishop Luis Mena Arroyo (transferred) |
| Daonium | 1986.10.27 | Bishop Jerzy Modzelewski (died) |
| Daphnusia | 1967.04.24 | Bishop Thaddeus Lê Hữu Từ, O. Cist. (died) |
| Daphnutium | 1933 | |
| Dara | 1971.08.10 | Archbishop Nicholas Thomas Elko (transferred) |
| Dascylium | 1978.01.17 | Bishop Juliusz Bieniek (died) |
| Daulia | 1972.06.28 | Bishop Franciszek Jop (transferred) |
| Dausara | 1969.12.26 | Bishop Henri Martin Mekkelholt, S.C.I. (died) |
| Demetrias | 1979.08.02 | Bishop Francis Arthur Carvalho (died) |
| Derbe | 1971.11.13 | Bishop Raymond Peter Hillinger (died) |
| Dercos | 1970.11.27 | Archbishop Armand-Etienne M. Blanquet du Chayla, O.C.D. (died) |
| Diocæsarea in Isauria | 1969.05.05 | Archbishop Gino Paro (transferred) |
| Diocæsarea in Palæstina | 1964.05.26 | Bishop Simone Lorenzo Salvi, O.S.B. Subl. (died) |
| Dioclea | 1985.01.12 | Bishop Youannès Malak (died) |
| Diocletianoplis in Thebaide | 1933 | |
| Diocletianoplis in Thracia | 2006.05.12 | Archbishop Metodi Dimitrov Stratiev, A.A. (died) |
| Diocletianopolis in Palæstina | 1965.12.04 | Bishop Aníbal Maricevich Fleitas (transferred) |
| Dionysias | 1966.11.15 | Archbishop Daniel Willem Stuyvenberg, S.M. (transferred) |
| Dionysiopolis | 1983.01.28 | Archbishop Jean-Édouard-Lucien Rupp (died) |
| Dioshieron | 1933 | |
| Diospolis in Thracia | 1966.08.29 | Bishop Adriano Mandarino Hypólito, O.F.M. (transferred) |
| Diospolis inferior | 1996.11.15 | Bishop Paul-Maurice Choquet, C.S.C. (died) |
| Diospolis superior | 2007.01.09 | Bishop Nemesio Rivera Meza (died) |
| Dium | 1976.03.15 | Bishop Irzio Luigi Magliacani, O.F.M. Cap. (died) |
| Doara | 1980.11.25 | Bishop Aleksander Moscicki (died) |
| Doberus | 1971.08.05 | Bishop Jan Fondaliński (died) |
| Docimium | 1983.01.14 | Bishop Wacław Majewski (died) |
| Dodona | 1983.09.12 | Bishop Josip Lach (died) |
| Doliche | 1997.09.08 | Bishop Miguel Saturnino Aurrecoechea Palacios, O.F.M. Cap. (died) |
| Dometiopolis | 1965.11.13 | Bishop István Zadravecz, O.F.M. (died) |
| Dora | 1980.02.04 | Bishop Rafael Torija de la Fuente (transferred) |
| Dorostorum | 1933 | |
| Dorylaëum | 1972.12.06 | Bishop Henri-Charles Dupont (died) |
| Dragobitia | 1850.09.29 | Bishop John Briggs (transferred) |
| Drizipara | 1967.11.23 | Archbishop Theotonius Amal Ganguly, C.S.C. (transferred) |
| Dystis | 1986.03.06 | Archbishop Emilio de Brigard Ortiz (died) |
| Ecdaumava | 1933 | |
| Echinus | 1966.11.15 | Archbishop Eugène Klein, M.S.C. (transferred) |
| Ecsalus | 1933 | |
| Edessa in Macedonia | 1975.12.13 | Bishop Hernando Antiporda (died) |
| Edessa in Osrhoëne | 1969.10.28 | Archbishop Luigi Centoz (died) |
| Edessa in Osrhoëne (Syriac Rite) | 1993.10.15 | Archbishop Grégoire Ephrem Jarjour (died) |
| Edessa in Osrhoëne (Greek-Melkite Rite) | 2011.04.29 | Archbishop Salim Ghazal, B.S. (died) |
| Elæa | 1966.11.05 | Bishop Heinrich Roleff (died) |
| Elatea | 1981.05.26 | Archbishop Dominic Deng Yi-ming (Tang Yee-ming) (鄧以明), S.J. (transferred) |
| Elephantaria in Proconsulari | 2021.06.09 |  Archbishop Mandla Siegfried Jwara, C.M.M. (64) (transferred) |
| Eleutherna | 1969.05.11 | Bishop Salomão Barbosa Ferraz (died) |
| Eleutheropolis in Macedonia | 1933 | |
| Eleutheropolis in Palæstina | 1966.11.15 | Bishop Alfred Matthew Stemper, M.S.C. (transferred) |
| Elis | 1987.05.23 | Bishop Gellért Belon (died) |
| Elusa | 1964.07.28 | Bishop Joseph Basil Roper (died) |
| Eluza | 1967.09.06 | Archbishop Nivaldo Monte (transferred) |
| Ephesus | 1992.05.22 | Archbishop Giovanni Enrico Boccella, T.O.R. (died) |
| Epiphania in Cilicia | 1971.09.29 | Bishop Emiliano José Lonati, O.F.M. Cap. (died) |
| Epiphania in Syria | 1990.09.29 | Bishop Vladimiro Malanczuk, C.SS.R. (died) |
| Eressus | 1997.09.26 | Bishop José María Querejeta Mendizábal, C.M.F. (died) |
| Eriza | 1961.07.11 | Bishop Octave-Louis Pasquet (died) |
| Erra | 1933 | |
| Erythræ | 1964.07.07 | Bishop Demetrio Mansilla Reoyo (transferred) |
| Erythrum | 1969.01.22 | Bishop Ghebre Jesus Jacob (died) |
| Esbus | 1970.11.22 | Bishop Joseph-Georges-Arthur Melançon (resigned) |
| Etenna | 1964.08.28 | Bishop Thomas Holland (transferred) |
| Euaza | 1933 | |
| Eucarpia | 1978.03.20 | Bishop Estêvão Cardoso de Avellar, O.P. (transferred) |
| Euchaitæ | 1972.06.28 | Cardinal Bolesław Kominek (transferred) |
| Eudocia | 1999.02.03 | Bishop Jan Czerniak (died) |
| Eudocias | 1933 | |
| Eudoxias | 1994.11.16 | Bishop Raul Silva Silva (died) |
| Eumenia | 2001.12.20 | Bishop Theodorus Gerardus Antonius Hendriksen (died) |
| Eurœa in Epiro | 1965.08.03 | Archbishop Alfonso Niehues (transferred) |
| Eurœa in Phœnicia | 1976.01.14 | Bishop Edoardo Piana Agostinetti (died) |
| Europus | 1948.05.13 | Bishop Daniel Ivancho (transferred) |
| Eutyme | 1966.03.06 | Bishop Jean-Barthélemy-Marie de Cambourg (transferred) |
| Ezerus | 1957.07.06 | Bishop Antonio Sévat, C.M. (died) |
| Famagusta | 1974.04.01 | Archbishop Giuseppe Schiavini (died) |
| Faustinopolis | 1973.03.16 | Bishop Bernard Czapliński (transferred) |
| Flavias | 1969.08.20 | Archbishop Marijan Oblak (transferred) |
| Gabæ | 1996.05.14 | Bishop Hanna Kaldany (died) |
| Gabula | 1980.10.10 | Archbishop Francis Carroll, S.M.A. (died) |
| Gadara | 1973.10.31 | Bishop Jean Cassaigne, M.E.P. (died) |
| Gangra | 1989.02.28 | Archbishop Antônio Ferreira de Macedo, C.SS.R. (died) |
| Garella | 1972.03.25 | Archbishop Francisco Javier Nuño y Guerrero (transferred) |
| Gargara | 1964.02.12 | Archbishop Gabriel Ganni (transferred) |
| Garin (Armenian Rite) | 1972 | |
| Gaza | 1964.02.24 | Bishop James Henry Ambrose Griffiths (died) |
| Gazera | 1985.09.04 | Bishop Angel Rodríguez Gamoneda, O.S.A. (died) |
| Gerara | 1956.08.04 | Bishop Henri-Louis-Toussaint Vion (transferred) |
| Geras | 1977.07.04 | Bishop John Michael Fearns (died) |
| Gerasa | 2011.06.15 | Bishop Nicholas James Samra (76) (transferred) |
| Germa in Hellesponto | 1966.02.24 | Archbishop Lorenzo Gargiulo (transferred) |
| Germanicia | 1914.01.02 | Bishop Everhard Illigens (died) |
| Germanicopolis | 1968.02.24 | Bishop Lionello Berti, O.M.I. (died) |
| Germia | 1967.06.29 | Cardinal Alfredo Pacini (transferred) |
| Gindarus | 1965.12.18 | Bishop Simon N’Zita Wa Ne Malanda (transferred) |
| Giustinianopolis in Galatia | 1982.05.12 | Archbishop Carmine Rocco (died) |
| Glavinitza | 2021.04.27 | Bishop Krzysztof Jakub Wętkowski (57) (transferred) |
| Gomphi | 1976.08.02 | Bishop Valeriano Ludovico Arroyo Paniego, O.F.M. (died) |
| Gordoserba | 1933 | |
| Gortyna | 1987.01.12 | Archbishop Victor Frederick Foley, S.M. (died) |
| Hadriani ad Olympum | 1997.02.03 | Bishop Aristide Pirovano, P.I.M.E. (died) |
| Hadriania | 1981.11.21 | Archbishop Gennaro Maria Prata Vuolo, S.D.B. (transferred) |
| Hadrianopolis in Epiro | 1964.04.10 | Bishop Josef Freusberg (died) |
| Hadrianopolis in Hæmimonto | 1997.10.25 | Archbishop Lino Zanini (died) |
| Hadrianopolis in Honoriade | 1985.02.11 | Bishop Joseph Maria Pernicone (died) |
| Hadrianopolis in Pisidia | 1970.12.20 | Bishop Filemón Castellano (resigned) |
| Hadrianotheræ | 1997.12.25 | Archbishop Bronisław Dabrowski, F.D.P. (died) |
| Halicarnassus | 1970.05.16 | Bishop Bernard James Sullivan, S.J. (died) |
| Harpasa | 1969.12.06 | Bishop Stanislav Zela (died) |
| Hebron | 1968.09.15 | Bishop Pedro Massa, S.D.B. (died) |
| Helenopolis in Bithynia | 1967.02.06 | Bishop Wojciech Tomaka (died) |
| Helenopolis in Palæstina | 1990.05.30 | Bishop John Francis Hackett (died) |
| Heliopolis in Augustamnica | 1861.08.31 | Bishop Francesco Pichi (died) |
| Heliopolis in Phœnicia | 1965.08.23 | Archbishop Ottavio De Liva (died) |
| Heliosebaste | 1972.07.01 | Bishop Florentino de Andrade e Silva (transferred) |
| Helos | 1996.05.24 | Bishop Joaquín Carmelo Borobia Isasa (85) (transferred) |
| Hemeria | 1965.01.30 | Archbishop George Joseph Biskup (transferred) |
| Hemesa | 1970.10.12 | Archbishop Joseph Francis McGeough (died) |
| Hephæstus | 1977.11.25 | Bishop André-Gustave-Émile Leclerc (died) |
| Heraclea ad Latnum | 1933 | |
| Heraclea in Europa | 1986.04.04 | Archbishop Mario Cagna (died) |
| Heraclea Pelagoniæ | 1933 | |
| Heraclea Salbace | 1933 | |
| Heracleopolis magna | 1973.03.05 | Cardinal Paul-Pierre Philippe, O.P. (transferred) |
| Hermocapelia | 1933 | |
| Hermonthis | 2003.11.16 | Bishop Augustine Eugene Hornyak, O.S.B.M. (died) |
| Hermopolis parva | 1968.10.18 | Cardinal James Darcy Freeman (transferred) |
| Hexamilium | 1933 | |
| Hierapolis in Isauria | 1976.01.16 | Bishop José Alberto Lopes de Castro Pinto (transferred) |
| Hierapolis in Phrygia | 1969.04.10 | Archbishop Lorenzo Maria Balconi (巴明善), P.I.M.E. (died) |
| Hierapolis in Syria | 1982.08.20 | Archbishop Antonio del Giudice (died) |
| Hierapolis in Syria (Greek-Melkite Rite) | 1962.03.19 | Cardinal Gabriel Acacius Coussa, B.A. (transferred) |
| Hierapytna | 1933 | |
| Hierissus | 1974.12.24 | Bishop Teodoro Eugenín Barrientos, SS.CC. (died) |
| Hierocæsarea | 1994.12.31 | Bishop Ernesto de Paula (died) |
| Hieropolis | 1970.03.07 | Archbishop Youhannan Semaan Issayi (transferred) |
| Hippos | 1945.10.23 | Bishop Nicanor Roberto Aguirre Baus (transferred) |
| Hólar | 2021.01.04 | Bishop Marek Solarczyk (54) (transferred) |
| Homona | 1933 | |
| Horrea Cœlia | 2021.03.03 | Bishop Duncan Theodore Tsoke (57) (transferred) |
| Hyda in Lycaonia | 1933 | |
| Hyllarima | 1964.01.17 | Bishop Stefan Barela (transferred) |
| Hypæpa | 1946.04.11 | Bishop Raymond Aloysius Lane (林化東), M.M. (transferred) |
| Hypselis | 1997.07.14 | Bishop Jesús Serrano Pastor, C.M.F. (died) |
| Hyrcanis | 1933 | |
| Iabruda | 1956.05.17 | Bishop Henri Friteau, C.S.Sp. (died) |
| Iamnia | 1965.03.16 | Bishop Thomas Asagoro Wakida (トマ脇田浅五郎) (died) |
| Iasus | 1969.02.07 | Bishop Salvador Martinez Silva (died) |
| Ibora | 1973.12.31 | Bishop Vincent Victor Dereere, O.C.D. (died) |
| Iconium | 1973.03.05 | Cardinal Sergio Pignedoli (transferred) |
| Idebessus | 1967.11.29 | Bishop Baptist Mudartha (transferred) |
| Ilistra | ? | |
| Ilium | 1968.02.07 | Bishop Francesco Maria Franco (died) |
| Ingila | 1966.06.07 | Bishop Armand Coupel (died) |
| Ioannina | 1967.05.29 | Bishop Glennon Patrick Flavin (transferred) |
| Ionopolis | 1966.08.12 | Bishop Hubert Joseph Paulissen, S.M.A. (died) |
| Ioppe | 1965.10.14 | Bishop Apollinaris William Baumgartner (アポリナリス・バウムガートナー), O.F.M. Cap. (transferred) |
| Ios | 1965.11.10 | Bishop Michel Blecharczyk (died) |
| Iotapa in Isauria | 1933 | |
| Iotapa in Palestina | 1933 | |
| Ipsus | 1950.04.01 | Bishop Leo Fabiano Fahey (died) |
| Irenopolis in Cilicia | 1975.07.04 | Bishop Gaetano Michetti (transferred) |
| Irenopolis in Isauria | 1971.05.11 | Bishop George Alapatt (resigned) |
| Isauropolis | 1971.03.30 | Archbishop Philip Francis Pocock (transferred) |
| Isba | 1966.10.03 | Bishop Lionel Scheffer, O.M.I. (died) |
| Isinda | 1994.10.24 | Bishop Joseph William Regan, M.M. (died) |
| Iuliopolis | 1981.07.16 | Bishop Ioan Duma, O.F.M. Conv. (died) |
| Kaškar (Chaldean Rite) | 2003.12.03 | Cardinal Emmanuel III Delly (Emmanuel-Karim Delly) (transferred) |
| Kharput (Armenian Rite) | 1972 | |
| Lacedæmonia | 1967.04.27 | Bishop José de Jesús Garcia Ayala (transferred) |
| Lagania | 1971.02.23 | Bishop Xavier Geeraerts, M. Afr. (died) |
| Lagina | 1970.05.21 | Bishop León Angel Olano y Urteaga, O.F.M. Cap. (died) |
| Lamia | 1982.11.15 | Bishop Henry Byrne, S.S.C.M.E. (transferred) |
| Lampsacus | 1970.08.04 | Bishop David Frederick Cunningham (transferred) |
| Lamus | 1967.06.12 | Bishop Sisto Mazzoldi, M.C.C.J. (transferred) |
| Laodicea ad Libanum | 2012.08.21 | Bishop Paul Bassim, O.C.D. (died) |
| Laodicea combusta | 1933 | |
| Laodicea in Phrygia | 1968.06.25 | Archbishop Émile André Jean-Marie Maury (transferred) |
| Laodicea in Syria | 1986.12.01 | Archbishop Martin John O’Connor (died) |
| Lapithus | 1933 | |
| Lappa | 1973.07.22 | Bishop Carlos de la Trinidad Borge y Castrillo (died) |
| Laranda | 1965.01.06 | Bishop Walfrido Teixeira Vieira (transferred) |
| Larissa in Syria | 1987.09.09 | Bishop Bonaventure Akiki, O.F.M. (died) |
| Larissa in Thessalia | 1980.03.09 | Archbishop Giuseppe Mojoli (died) |
| Latopolis | 1964.12.12 | Bishop Ernest Leo Unterkoefler (transferred) |
| Lauzadus | 1964.03.25 | Archbishop Vicente Angelo José Marchetti Zioni (transferred) |
| Lebedus | 2000.01.17 | Bishop Vasile Cristea, A.A. (died) |
| Lebessus | 1968.01.16 | Bishop Karmelo Zazinović (transferred) |
| Lemnus | 1976.01.23 | Archbishop François-Marie-Joseph Poirier (died) |
| Leontopolis in Augustamnica | 1970.11.30 | Archbishop Cornelius Bronsveld, M. Afr. (resigned) |
| Leotopolis in Pamphylia | 1972.09.19 | Archbishop Giuseppe D’Avack (resigned) |
| Lerus | 1985.05.25 | Cardinal Luigi Dadaglio (transferred) |
| Letopolis | 1967.03.20 | Bishop Jan Jaroszewicz (transferred) |
| Leucas | 1974.09.21 | Archbishop Ivan Bucko (died) |
| Leuce | 1987.03.26 | Bishop Vasile Louis Puscas (transferred) |
| Lidoricium | 1933 | |
| Limnæ | 1968.06.10 | Bishop Francis Anthony Marrocco (transferred) |
| Limyra | 1999.11.08 | Bishop Alfons Karl Kempf (died) |
| Linoë | 1959.06.21 | Venerable Bishop Alfredo Maria Obviar y Aranda (transferred) |
| Lipara | 1963.07.13 | Bishop Alfredo Galindo Mendoza, M.Sp.S. (transferred) |
| Lititza | 1933 | |
| Livias | 1972.10.21 | Bishop Francesco Tortora, O.M. (transferred) |
| Lizicus | 1933 | |
| Loryma | 1974.11.07 | Bishop Vittorio Longo (died) |
| Lunda | 1981.08.21 | Bishop Luís António Palha Teixeira, O.P. (died) |
| Lupadium | ? | |
| Lycaonia | 1965.05.15 | Archbishop Henri-Martin-Félix Jenny (transferred) |
| Lyrbe | 1965.12.01 | Bishop Alexander Mieceslaus Zaleski (transferred) |
| Lysias | 1969.08.02 | Bishop Federico Sargolini (died) |
| Lystra | 1968.07.03 | Blessed Bishop Enrique Ángel Angelelli Carletti (transferred) |
| Macra | 1997.09.18 | Archbishop John Dooley, S.S.C.M.E. (died) |
| Madytus | 1965.10.27 | Archbishop Leo Hale Taylor, S.M.A. (died) |
| Magnesia ad Mæandrum | 1962.11.12 | Bishop John of the Cross Anyogu (transferred) |
| Magnesia ad Sipylum | 1933 | |
| Magydus | 1975.03.21 | Bishop Vunibaldo Godchard Talleur, O.F.M. (died) |
| Maina | 1963.08.31 | Bishop Pierre-Francis-Lucien-Anatole Boillon (transferred) |
| Maiuca | 2021.04.27 | Bishop Jan Stefan Gałecki (died) |
| Maiumas Gazæ | 1933 | |
| Mallus | 1990.02.12 | Bishop Joseph Peter Michael Denning (died) |
| Malus | 1933 | |
| Mæonia | 1933 | |
| Marasc (Armenian Rite) | 2006.03.15 |  Archbishop Kévork Khazoumian (86) (transferred) |
| Marciana | 1971.10.28 | Bishop Pierre Brot (died) |
| Marcopolis | 1969.12.05 | Bishop Jazeps Rancans (died) |
| Mardin (Armenian Rite) | 2017.11.21 | Archbishop Vartan Kechichian, C.A.M. (died) |
| Mardin (Chaldean Rite) | 1972 | |
| Mariamme | 2021.04.14 | Bishop Claudiu-Lucian Pop (48) (transferred) |
| Marida | 1965.12.14 | Bishop Jean Hermil (transferred) |
| Marmarizana | 1739.09.16 | Bishop Thomas O’Beirne (transferred) |
| Maronea | 1984.11.29 | Archbishop Franz Jáchym (died) |
| Martyropolis | 1967.11.15 | Archbishop João Resende Costa, S.D.B. (transferred) |
| Massimianopolis in Arabia | 1933 | |
| Massimianopolis in Palæstina | 1980.06.18 | Bishop Auguste Grimault, C.S.Sp. (died) |
| Massimianopolis in Pamphylia | 1933 | |
| Massimianopolis in Rhodope | 1970.01.09 | Archbishop Adam Hefter (died) |
| Massimianopolis in Thebaide | 1933 | |
| Mastaura in Asia | 1968.03.15 | Bishop Edward Jan Muszynski (died) |
| Mastaura in Lycia | 1933 | |
| Matrega | 1994.03.07 | Bishop Rafael González Estrada (died) |
| Mattiana | 2021.05.21 | Bishop Carlos Alberto Salcedo Ojeda, O.M.I. (60) (transferred) |
| Maximianæ | ? | |
| Medea | 1982.08.17 | Bishop Stephen Joseph Donahue (died) |
| Megalopolis in Peloponneso | 1933 | |
| Megara | 1969.03.18 | Bishop Charles Alphonse Armand Vanuytven, O. Praem. (died) |
| Mela | 1975.09.28 | Bishop Lucjan Bernacki (died) |
| Melitene | 1967.04.13 | Cardinal James Robert Knox (transferred) |
| Melitene (Armenian Rite) | 2013.02.02 | Bishop Jean Teyrouz, I.C.P.B. (80) (transferred) |
| Meloë in Isauria | 1964.09.26 | Bishop Paulus Rusch (resigned) |
| Meloë in Lycia | 1894.07.11 | Bishop Giovanni Battista Mantovano, O.M. (died) |
| Melzi | 2020.05.06 | Bishop Guy Desrochers, C.SS.R. (65) (transferred) |
| Menelaites | 1994.03.04 | Bishop Octave-Marie Terrienne, M.S.C. (died) |
| Menois | 1968.01.19 | Bishop Vincent Gelat (died) |
| Mentesa | 2021.06.09 | Bishop José Rico Pavés (54) (transferred) |
| Merus | 1933 | |
| Mesotymolus | 1933 | |
| Messene | 1991.06.28 | Cardinal Fiorenzo Angelini (transferred) |
| Metaba | 1933 | |
| Metelis | 1973.05.23 | Bishop Joseph Francis Flannelly (died) |
| Metellopolis | 1971.08.21 | Bishop Amedeo Polidori (died) |
| Methone | 1968.04.19 | Bishop Bertoldo Bühl, O.F.M. (died) |
| Methymna | 1966.11.17 | Archbishop Manuel Nuñes Gabriel (transferred) |
| Metræ | 1995.03.20 | Bishop Amadeu González Ferreiros, O. de M. (died) |
| Metropolis in Asia | 1992.08.29 | Bishop Juan de Dios López de Victoria (died) |
| Metropolis in Pisidia | 1933 | |
| Midaëum | 1979.04.15 | Bishop Ernesto Çoba (died) |
| Middelburg | 2017.12 | |
| Miletopolis | 1968.12.08 | Bishop Juan Ricote Alonso (transferred) |
| Miletus | 1970.10.17 | Cardinal Salvatore Pappalardo (transferred) |
| Missua | 2021.05.02 | Bishop Paul Vollmar, S.M. (died) |
| Misthia | 1967.04.16 | Archbishop René Graffin, C.S.Sp. (died) |
| Mitylene | 1981.10.17 | Archbishop Maurílio Jorge Quintal de Gouveia (transferred) |
| Mnizus | 1933 | |
| Mocissus | 1964.03.24 | Archbishop Gabrijel Bukatko (transferred) |
| Modra | 1968.12.09 | Bishop Manoel Könner, S.V.D. (died) |
| Monembasia | 1933 | |
| Mopsuestia | 1963.08.03 | Bishop Joseph Gotthardt, O.M.I. (died) |
| Mossyna | 1975.05.01 | Bishop Oscar Sevrin, S.J. (died) |
| Mostene | 1964.11.26 | Bishop Leo Isidore Scharmach, M.S.C. (died) |
| Mosynopolis | 1966.11.15 | Bishop Rudolf Joseph Manfred Staverman, O.F.M. (transferred) |
| Mundinitza | 1966.11.15 | Bishop Ignatius John Doggett, O.F.M. (transferred) |
| Musbanda | 1933 | |
| Mush (Armenian Rite) | 1972 | |
| Mylasa | 1966.05.14 | Bishop Peregrin de la Fuente Néstar, O.P. (died) |
| Myndus | 1973.01.20 | Archbishop Enrico Bartoletti (transferred) |
| Myra | 1967.06.29 | Cardinal Egidio Vagnozzi (transferred) |
| Myra (Greek-Melkite Rite) | 2014.06.21 | Archbishop Michel Abrass (72) (transferred) |
| Myrica | 1991.07.27 | Bishop Maximiliano Spiller, C.S.I. (died) |
| Myrina | 1984.09.11 | Bishop Alfred-Jean-Félix Ancel, Prado (died) |
| Nachingwea | 2020.07.03 | Bishop Benjamin Phiri (62) (transferred) |
| Nacolia | 1973.05.02 | Archbishop Joseph Rabbani (died) |
| Nasala | 1933 | |
| Nasbinca | 2021.04.27 | Bishop Walter Guillén Soto, S.D.B. (59) (transferred) |
| Naucratis | 1933 | |
| Naupactus | 1977.09.25 | Archbishop Roberto Ronca (died) |
| Nauplia | 1995.09.18 | Bishop Andrei Katkoff, M.I.C. (died) |
| Nazianzus | 1999.04.24 | Bishop Miguel Mykycej, F.D.P. (transferred) |
| Nea Aule | 1760.03.27 | Bishop Arnaud-François Lefèbvre, M.E.P. (died) |
| Nea Valentia | 1933 | |
| Neapolis in Arabia | ? | Bishop Pedro Mirabal Ayllón (resigned) |
| Neapolis in Caria | 1933 | |
| Neapolis in Cypro | 1933 | |
| Neapolis in Isauria | 1933 | |
| Neapolis in Palæstina | 1988.06.28 | Cardinal Jacques Martin (transferred) |
| Neapolis in Pisidia | 1967.05.25 | Archbishop Pietro Sigismondi (died) |
| Neila | 1972.06.09 | Bishop Róbert Pobožný (died) |
| Neocæsarea in Bithynia | 1933 | |
| Neocæsarea in Ponto | 1967.07.30 | Archbishop Antonin-Fernand Drapier, O.P. (died) |
| Neocæsarea in Syria | 1988.10.24 | Bishop Marcel-Pierre-Armand Riopel (died) |
| Nephelis | 1982.11.24 | Bishop José Alfonso Tscherrig, C.SS.R. (died) |
| Neve | 1963.09.09 | Cardinal William John Conway (transferred) |
| Nicæa | 1976.04.10 | Archbishop Ilario Alcini (died) |
| Nicæa parva | 1996.12.05 | Archbishop Paolino Limongi (died) |
| Nicius | 1970.12.01 | Bishop Peter Rogan, M.H.M. (died) |
| Nicomedia | 1969.04.28 | Cardinal Paolo Bertoli (transferred) |
| Nicopolis ad Nestum | 1981.01.30 | Archbishop John Gordon (died) |
| Nicopolis in Armenia | 1944.03.02 | Bishop Jules-Joseph Cénez, O.M.I. (died) |
| Nicopolis in Epiro | 1971.06.11 | Archbishop Joseph-Paul Strebler, S.M.A. (resigned) |
| Nicopsis | 1966.10.12 | Archbishop Juan C. Sison (transferred) |
| Nicosia | 1990.04.30 | Archbishop Aurelio Signora (died) |
| Nilopolis | 1978.01.10 | Archbishop Luis Sánchez-Moreno Lira (resigned) |
| Nisibis | 1968.07.18 | Archbishop José de la Cruz Turcios y Barahona, S.D.B. (died) |
| Nisibis (Maronite Rite) | 1974.05.18 | Archbishop Pietro Sfair (died) |
| Nisyrus | 1969.08.08 | Bishop Auguste Joseph Gaudel (died) |
| Novæ | 2021.06.08 | Bishop Ducange Sylvain, S.D.B. (died) |
| Novæ Patræ | 1967.09.16 | Archbishop Angelo Innocent Fernandes (transferred) |
| Nubia | 2011.12.29 | Archbishop Paul Antaki (died) |
| Numericus | 1933 | |
| Nysa in Asia | 1933 | |
| Nyssa | 2012.10.07 | Bishop Roman Danylak (died) |
| Oasis magna | 1933 | |
| Oca | 1933 | |
| Odessus | 1970.10.07 | Archbishop Xavier Ferdinand J. Thoyer, S.J. (died) |
| Olba | 1992.09.18 | Bishop Augustine Danglmayr (died) |
| Olbia | 1978.05.26 | Bishop Arcângelo Cerqua, P.I.M.E. (resigned) |
| Olena | 1995.06.14 | Bishop Clemente Geiger, C.PP.S. (died) |
| Olympus | 1975.06.06 | Bishop Segundo García Fernández, S.D.B. (died) |
| Ombi | 1966.02.03 | Archbishop António de Castro Xavier Monteiro (transferred) |
| Onchesmus | 1933 | |
| Œnoanda | 1965.12.18 | Bishop Francis Xavier Sanguon Souvannasri (transferred) |
| Onuphis | 1966.11.15 | Bishop Francis John Doyle, M.S.C. (transferred) |
| Opus | 1980.10.04 | Bishop Lawrence-Patrick Whelan (died) |
| Orcistus | 1967.07.13 | Bishop Paul Piché, O.M.I. (transferred) |
| Oreus | 1966.04.28 | Archbishop Ildefonso Maria Sansierra Robla, O.F.M. Cap. (transferred) |
| Orisa | 1992.05.19 | Bishop Józef Kurpas (died) |
| Orthosia in Phœnicia | 1964.02.07 | Cardinal Narciso Jubany Arnau (transferred) |
| Orthosias in Caria | 1933 | |
| Orymna | 1933 | |
| Ostracine | 2018.06.01 | Bishop Milan Lach, S.J. (47) (transferred) |
| Otrus | 1995.04.22 | Bishop Charles-Joseph Lemaire (惠化民), M.E.P. (died) |
| Ottana | 2019.06.17 | Bishop Piotr Sawczuk (59) (transferred) |
| Oxyrynchus | 1966.01.04 | Archbishop Juan Manoel González Arbeláez (died) |
| Pachnemunis | 1965.12.21 | Bishop Eusebio Septimio Mari, O.F.M. Cap. (died) |
| Palæopolis in Asia | 1967.05.06 | Cardinal Emmanuel III Delly (Emmanuel-Karim Delly) (transferred) |
| Palæopolis in Pamphylia | 1985.04.25 | Bishop Ioan Dragomir (died) |
| Palmyra | 1983.03.02 | Bishop Giuseppe Rossi (died) |
| Paltus | 1967.06.26 | Cardinal Maximilien de Fürstenberg (transferred) |
| Pamphilus | 1933 | |
| Panemotichus | 1976.11.12 | Bishop John Zhang Bi-de (張弼德) (died) |
| Panephysis | 1933 | |
| Panopolis | 1968.12.26 | Bishop Zygmunt Choromański (died) |
| Paphus | 1973.08.14 | Bishop Jeremiah Francis Minihan (died) |
| Pappa | 1933 | |
| Paralus | 1972.06.23 | Bishop Johannes Olav Smit (died) |
| Parætonium | 1964.02.11 | Bishop Frans Joseph Bruls Canisius, S.M.M. (transferred) |
| Parembolæ in Arabia | 1979.03.18 | Bishop Abdallah Nujaim (died) |
| Parembolæ in Palæstina | 1933 | |
| Parium | 1968.03.11 | Archbishop Philippe Nguyễn Kim Ðiền (transferred) |
| Parlais | 1967.06.12 | Bishop William Zephyrine Gomes (transferred) |
| Parnassus | 2002.05.08 | Bishop Adolfo Luís Bossi, O.F.M. Cap. (died) |
| Paros | 1977.07.06 | Bishop Francesco Bertoglio (died) |
| Passo Corese | 2020.11.28 |  Cardinal Enrico Feroci (80) (transferred) |
| Patræ | 1971.08.26 | Archbishop Luigi Fogar (died) |
| Pedachtoë | 1967.08.18 | Archbishop Hilaire Marie Vermeiren, M.S.C. (died) |
| Pegæ | 1973.02.12 | Bishop Innocenzo Alfredo Russo, O.F.M. (died) |
| Pella | 2002.03.04 | Bishop Pedro Grau y Arola, C.M.F. (died) |
| Peltæ | 1950.03.28 | Bishop Stephen Stanislaus Woznicki (transferred) |
| Pelusium | 1965.04.10 | Archbishop Patrick Mary O’Donnell (transferred) |
| Perdices | 2019.02.15 | Bishop Thomas Joseph Costello (died) |
| Pergamum | 1994.09.08 | Bishop John Michael Bilock (died) |
| Perge | 1970.01.03 | Archbishop Joseph Angel Poli, O.F.M. Cap. (died) |
| Peristasis | 1718.10.12 | Bishop Thomas Joseph Nicolson (died) |
| Peritheorium | 1933 | |
| Perperene | 1933 | |
| Perrhe | 1976.01.05 | Bishop Henri Joseph Marie Belleau, O.M.I. (died) |
| Perta | 1965.11.19 | Archbishop Joseph Angel Poli, O.F.M. Cap. (transferred) |
| Pessinus | 1971.01.15 | Archbishop Gabriel Ganni (transferred) |
| Petinessus | 1966.06.21 | Archbishop Victor Frederick Foley, S.M. (transferred) |
| Petnelissus | 1981.08.19 | Bishop Joachim Ammann, O.S.B. (died) |
| Petra in Ægypto | 1933 | |
| Petra in Lazica | 1933 | |
| Petra in Palæstina | 1970.12.04 | Archbishop Alfredo Silva Santiago (resigned) |
| Phacusa | 1984.01.20 | Bishop Francisco Xavier Elias Pedro Paulo Rey, T.O.R. (died) |
| Phæna | 2019.07.12 | Archbishop Youhanna Jihad Battah (65) (transferred) |
| Phæno | 1933 | |
| Pharan | 1976.01.14 | Bishop Guilio Barbetta (died) |
| Pharbæthus | 1986.06.25 | Bishop Francisco Espino Porras (died) |
| Pharsalus | 1972.07.22 | Bishop Giuseppe Cognata, S.D.B. (died) |
| Phaselis | 1970.07.27 | Bishop José Candida Piñol y Batres (died) |
| Phasis | 1976.05.28 | Archbishop Arturo Mery Beckdorf (died) |
| Phatanus | 1965.03.26 | Bishop Youhanna Nueir, O.F.M. (transferred) |
| Phelbes | 2019.10.11 | Bishop Jorge Ángel Saldías Pedraza, O.P. (52) (transferred) |
| Phellus | 1933 | |
| Philæ | 1965.11.05 | Bishop Luis Francisco Irizar Salazar, O.C.D. (died) |
| Philadelphia in Arabia | 1995.05.04 | Bishop Julian Groblicki (died) |
| Philadelphia in Lydia | 1970.11.26 | Bishop Augustin Arce Mostajo (resigned) |
| Philadelphia minor | 1968.12.30 | Bishop Bernardo Leonardo Fey Schneider, C.SS.R. (transferred) |
| Philippi | 1968.01.11 | Cardinal Duraisamy Simon Lourdusamy (transferred) |
| Philippopolis in Arabia | 1963.08.10 | Cardinal Giovanni Colombo (transferred) |
| Philippopolis in Thracia | 1967.04.01 | Archbishop Emile-Arsène Blanchet (died) |
| Philomelium | 1966.05.23 | Bishop James John Hogan (transferred) |
| Phoba | 1987.11.19 | Bishop José Félix Pintado Blasco, S.D.B. (died) |
| Phocæa | 1965.01.07 | Bishop William Richard Arnold (died) |
| Phragonis | 1933 | |
| Phulli | 1964.08.16 | Archbishop Willem Pieter Adrian Maria Mutsaerts (died) |
| Phytea | 2000.11.22 | Bishop Heinrich Pachowiak (died) |
| Pinara | 1974.07.21 | Bishop Alejandro Menchaca Lira (died) |
| Pionia | 1965.08.19 | Archbishop José Armando Gutiérrez Granier (transferred) |
| Pisita | 2021.02.26 | Bishop Yves-Georges-René Ramousse, M.E.P. (died) |
| Pitanæ | 1966.06.07 | Bishop John Jobst, S.A.C. (transferred) |
| Platæa | 1965.12.24 | Bishop Pedro Luis Maria Galibert, T.O.R. (died) |
| Platamon | 1933 | |
| Plestia | 2018.06.26 | Archbishop Francisco José Villas-Boas Senra de Faria Coelho (60) (transferred) |
| Plotinopolis | 1993.04.20 | Bishop Pavlo Vasylyk (transferred) |
| Pocofeltus | 2020.02.13 | Bishop Charles James McDonnell (died) |
| Podalia | 1969.06.29 | Bishop Antonio D’Erchia (transferred) |
| Pogla | 1982.05.12 | Bishop Gregório Alonso Aparicio, O.A.R. (died) |
| Polemonium | 1978.05.26 | Bishop Estanislau Arnoldo van Melis, C.P. (resigned) |
| Polybotus | 1965.08.05 | Bishop Tomas Wilczynski (died) |
| Polystylus | 1965.04.29 | Bishop Louis-August Chorin, M.E.P. (died) |
| Pœmanenum | 1933 | |
| Pompeiopolis in Cilicia | 1965.04.05 | Archbishop Johann Evangelist Müller (died) |
| Pompeiopolis in Paphlagonia | 1966.12.06 | Archbishop Jean Delay (died) |
| Porphyreon | 1995.03.12 | Bishop Petrus Canisius Jean van Lierde, O.S.A. (died) |
| Porthmus | 1756.12.20 | Bishop Eugenio Piloti (李愛哲), O.F.M. (died) |
| Prænetus | 1965.02.20 | Bishop Manuel de Jesus Pereira (transferred) |
| Preslavus | 1977.07.07 | Archbishop Benedetto Falcucci (died) |
| Priene | 1966.10.09 | Bishop Jacques Le Cordier (transferred) |
| Proconnesus | 1963.05.24 | Archbishop Cornelio Sebastiano Cuccarollo, O.F.M. Cap. (died) |
| Prostanna | 1933 | |
| Prusa | 1976.02.26 | Bishop Gregorio Elias Olazar Muruaga, C.P. (died) |
| Prusa (Armenian Rite) | 1972 | |
| Prusias ad Hypium | 1967.09.15 | Cardinal José Salazar López (transferred) |
| Prymnessus | 1933 | |
| Pselchis | 1933 | |
| Psibela | 1933 | |
| Ptolemais in Libya | 2021.06.24 | Archbishop Cyril Vasil’, S.J. (56) (transferred) |
| Ptolemais in Phœnicia | 1988.09.12 | Bishop Edmundo Luís Kunz (died) |
| Ptolemais in Thebaide | 1965.12.07 | Cardinal Pietro Parente (transferred) |
| Putia in Numidia | 2020.11.28 | Cardinal Cornelius Sim (transferred) |
| Pyrgos | 1988.02.08 | Archbishop Savino Bernardo Maria Cazzaro Bertollo, O.S.M. (transferred) |
| Rachlea | 1933 | |
| Raphanea | 2019.01.08 | Bishop Armando Bortolaso, S.D.B. (died) |
| Raphia | 1964.11.25 | Bishop John Willem Nicolaysen Gran, O.C.S.O. (transferred) |
| Rew-Ardashir (Chaldean Rite) | 1979.12.20 | Archbishop Joseph Cheikho (died) |
| Rhædestus | 1966.04.28 | Bishop Carlos Horacio Ponce de Léon (transferred) |
| Rhandus | 1995.10.27 | Bishop Jan-Wawrzyniec Kulik (died) |
| Rhesaina | 1972.01.21 | Bishop Gerardo Valencia Cano, M.X.Y. (died) |
| Rhinocorura | 1967.11.29 | Bishop Arthur Francis Fox (transferred) |
| Rhizæum | 1980.01.30 | Archbishop Francesco Lardone (died) |
| Rhodiapolis | 1965.11.15 | Bishop Jean-Louis-Antoine-Joseph Coudert, O.M.I. (died) |
| Rhodopolis | 1969.11.24 | Archbishop José Gonçalves da Costa, C.SS.R. (transferred) |
| Rhoina | 1968.11.10 | Archbishop Ferdinand Périer, S.J. (died) |
| Rhosus | 1967.07.13 | Bishop Marc Lacroix, O.M.I. (transferred) |
| Rhusium | 1971.03.07 | Archbishop Alberto Castelli (died) |
| Rusuca | 2020.12.29 | Bishop Geoffrey James Robinson (died) |
| Sabadia | 1967.07.31 | Archbishop Leo Christopher Byrne (transferred) |
| Sagalassus | 1964.03.15 | Bishop Fortunato da Veiga Coutinho (transferred) |
| Sais | 1980.07.21 | Bishop Amand Hubert, S.M.A. (died) |
| Saittæ | 1933 | |
| Sala | 1962.01.27 | Bishop Floyd Lawrence Begin (transferred) |
| Sala Consilina | 2018.12.21 | Bishop Gerard Bernacki (died) |
| Salamias | 1933 | |
| Salamis | 1995.12.18 | Archbishop Joseph Guo Ruo-shi (Kuo Joshih) (郭若石), C.D.D. (died) |
| Salona | 1964.12.16 | Bishop Alain-Sébastien Le Breton, S.M.M. (died) |
| Samos | 1974.03.09 | Bishop Giuseppe Olivotti (died) |
| Samosata | 1967.06.26 | Cardinal Pericle Felici (transferred) |
| Sanavus | 1969.02.07 | Bishop Mario Renato Cornejo Radavero ▼ (later Mr.) (transferred) |
| Sardes | 1976.05.24 | Cardinal Giuseppe Maria Sensi (transferred) |
| Sarepta | 1977.06.29 | Bishop Luis Andrade Valderrama, O.F.M. (died) |
| Sariphæa | 1933 | |
| Sæsina | 1978.05.26 | Bishop Adalberto Domingos Marzi, O.F.M. Cap. (resigned) |
| Sata | 1981.07.29 | Bishop James Edward Walsh (華理柱), M.M. (died) |
| Satafi | 2017.11.22 | Bishop Antônio Tourinho Neto (57) (transferred) |
| Satala in Armenia | 1977.01.26 | Bishop Salvador Herrera y Pinto, O.F.M. (died) |
| Satala in Lydia | 1933 | |
| Sauatra | 1964.02.02 | Bishop Jean-Marie Mazé, M.E.P. (died) |
| Sbida | 1966.06.21 | Bishop John Hubert Macey Rodgers, S.M. (transferred) |
| Scarphea | 1933 | |
| Scebatiana | 2020.04.02 | Bishop Bulus Dauwa Yohanna (50) (transferred) |
| Scepsis | 1933 | |
| Schedia | 1933 | |
| Sciathus | 1933 | |
| Scopelus in Hæmimonto | 2003.09.07 | Bishop Ivan Marghitych (died) |
| Scopelus in Thessalia | 1933 | |
| Scutarium | 1933 | |
| Scyrus | 1971.12.10 | Bishop Bernhard Schräder (died) |
| Scythopolis | 2005.06.10 | Archbishop Joseph-Marie Raya (died) |
| Sebaste (Armenian Rite) | 2006.12.24 | Archbishop Nerses Der Nersessian, C.A.M. (died) |
| Sebaste in Cilicia | 2000.08.23 | Bishop Cesario D’Amato, O.S.B. Cas. (died) |
| Sebaste in Palæstina | 1997.07.19 | Bishop Guerino Dominique Picchi, O.F.M. (died) |
| Sebaste in Phrygia | 1958.03.02 | Bishop Ferenc Rogacs (transferred) |
| Sebastea | 1989.07.27 | Archbishop Luigi Punzolo (died) |
| Sebastopolis in Abasgia | 1969.04.28 | Cardinal Giuseppe Paupini (transferred) |
| Sebastopolis in Armenia | 1990.11.13 | Bishop Léonce Tchantayan (died) |
| Sebastopolis in Thracia | 1978.04.24 | Bishop Andrés Sapelak, S.D.B. (transferred) |
| Sebela | 1964.11.13 | Bishop Oddo Bernacchia (died) |
| Sebennytus | 1933 | |
| Seert (Chaldean Rite) | 1972 | |
| Sela | 1970.06.04 | Archbishop Calogero Lauricella (transferred) |
| Seleucia ferrea | 1933 | |
| Seleucia in Isauria | 1971.08.31 | Archbishop William Mark Duke (died) |
| Seleucia Pieria | 1980.04.15 | Archbishop Jules Georges Kandela (died) |
| Seleucobelus | 1933 | |
| Selge | 1969.09.13 | Archbishop Bernard James Sheil (died) |
| Selinus | 1966.06.21 | Archbishop Pierre-Paul-Émile Martin, S.M. (transferred) |
| Selymbria | 1987.07.16 | Archbishop Emile-Joseph Socquet, M. Afr. (died) |
| Semnea | 1970.09.12 | Bishop Gerhard Schaffran (transferred) |
| Serbia | 1933 | |
| Sergentza | 1970.03.24 | Bishop Emilio Sosa Gaona, S.D.B. (died) |
| Sergiopolis | 1970.01.06 | Archbishop Antonio Taffi (died) |
| Serræ | 1967.07.29 | Archbishop Angelo Paino (died) |
| Setea | 1984.09.16 | Bishop Louis Abel Caillouet (died) |
| Sethroë | 1933 | |
| Sibidunda | 1933 | |
| Siblia | 1933 | |
| Sicyon | 1933 | |
| Side | 1973.03.05 | Cardinal Umberto Mozzoni (transferred) |
| Sidnacestre | 2020.06.09 | Bishop Francis Lagan (died) |
| Sidon | 1999.09.02 | Archbishop Romolo Carboni (died) |
| Sidyma | 1974.12.30 | Bishop Karl Reiterer, M.H.M. (died) |
| Silandus | 1968.02.12 | Bishop James Albert Duffy (died) |
| Silyum | 1964.08.11 | Archbishop Anthony Jordan, O.M.I. (transferred) |
| Sinda | 1987.11.17 | Bishop Thomas Bernard Pearson (died) |
| Siniandus | 1972.06.28 | Bishop Józef Drzazga (transferred) |
| Sinope | 1985.06.05 | Bishop Joseph Maria Reuß (died) |
| Sion | 1968.09.23 | Archbishop Luis Alonso Muñoyerro (died) |
| Soldaia | 1971.11.29 | Bishop José Romão Martenetz, O.S.B.M. (transferred) |
| Soli | 1964.03.26 | Bishop Humphrey Bright (died) |
| Sophene | 1970.01.02 | Bishop Patrick Shanley, O.C.D. (died) |
| Sora | 1967.06 | Bishop Alonso Manuel Escalante, M.M. (died) |
| Sorres | 2021.02.04 | Bishop Franz Josef Kuhnle (died) |
| Soteropolis | 2005.10.06 | Archbishop Ettore Cunial (died) |
| Sozopolis in Pisidia | 1933 | |
| Sozusa in Libya | 1989.12.11 | Bishop Guido Attilio Previtali, O.F.M. (died) |
| Sozusa in Palæstina | 1970.11.20 | Bishop Francis Joseph McSorley, O.M.I. (died) |
| Stadia | 1968.03.08 | Bishop Aloysius John Wycislo (transferred) |
| Stagoi | 1933 | |
| Stauropolis | 1971.06.19 | Archbishop Gabriel Thohey Mahn-Gaby (transferred) |
| Stectorium | 1966.06.21 | Bishop Pierre-Auguste-Antoine-Marie Guichet, M.S.C. (transferred) |
| Stobi | 1969.06.30 | Bishop Roman Richard Atkielski (died) |
| Stratonicea in Caria | 1977.02.06 | Bishop Carlos Guillermo Hartl de Laufen, O.F.M. Cap. (died) |
| Stratonicea in Lydia | 1933 | |
| Strongyle | 1933 | |
| Subrita | 1933 | |
| Sugdæa | 1970.12.07 | Archbishop Thomas Roberts, S.J. (resigned) |
| Sura | 1973.01.27 | Bishop Stefano Hász (died) |
| Syca | 1933 | |
| Sycomazon | 1933 | |
| Syedra | 1960.07.22 | Bishop Frederic Osterrath, O.S.B. Subl. (died) |
| Syene | 1984.04.13 | Bishop John Benjamin Grellinger (died) |
| Synaus | 2001.08.03 | Bishop Leo-Karel Jozef De Kesel (died) |
| Synnada in Phrygia | 1970.12.10 | Archbishop Marcel-François Lefebvre, C.S.Sp. ▼ (resigned) |
| Tabala | 1969.12.26 | Bishop Johannes Ross (ヨハネス・ロス), S.J. (died) |
| Tagarbala | 2021.03.15 | Bishop Gerard Alfons Kusz (died) |
| Taium | 1962.01.27 | Bishop Hugh Aloysius Donohoe (transferred) |
| Tamasus | 1984.05.14 | Bishop José Rincón Bonilla (died) |
| Tamiathis | 1966.03.31 | Bishop Antonio Cece (transferred) |
| Tanagra | 1983.03.26 | Bishop Stanisław Jakiel (died) |
| Tanais | 1965.09.08 | Bishop Agustín Adolfo Herrera (transferred) |
| Tanaramusa | 2018.10.01 | Archbishop Zeferino Zeca Martins, S.V.D. (55) (transferred) |
| Tanis | 1973.06.14 | Bishop José Joaquim Gonçalves (transferred) |
| Tanudaia | 2019.07.14 | Fr. Carlos Eugenio Irarrázaval Errázuriz (resigned) |
| Tapasa | 1933 | |
| Tarsus | 1973.03.05 | Cardinal Luigi Raimondi (transferred) |
| Tarsus (Greek-Melkite Rite) | 2017.06.20 |  Patriarch Youssef Absi (Joseph Absi, M.S.P.) (75) (resigned) |
| Taua | 1971.11.29 | Bishop Elias Coueter (transferred) |
| Tavium | 1965.07.08 | Bishop Carlo Niemira (died) |
| Tegea | 2006.12.05 | Bishop Bernard Matthew Kelly (died) |
| Tell-Mahrê | 1933 | |
| Telmissus | 1990.10.23 | Bishop George Martin Kuzma (transferred) |
| Temenothyræ | 1933 | |
| Temnus | 1966.03.05 | Archbishop Francis James Furey (transferred) |
| Temuniana | 2018.11.07 | Bishop Robert Anthony Brucato (died) |
| Tenedus | 1971.01.07 | Cardinal Giovanni Canestri (transferred) |
| Tentyris | 1972.09.11 | Bishop Jean-Rosière-Eugène Arnaud, M.E.P. (died) |
| Teos | 1996.12.28 | Bishop Edward Gerard Hettinger (died) |
| Terenuthis | 1973.12.13 | Bishop Biagio Sigibaldo Kurz, O.F.M. (died) |
| Termessus | 1981.05.25 | Bishop Neemeh Simaan (died) |
| Ternobus | 1967.06.29 | Cardinal Antonio Samorè (transferred) |
| Tetci | 2019.12.27 | Archbishop Luis Fernando Ramos Pérez (62) (transferred) |
| Teuchira | 1946.09.26 | Bishop François-Arsène-Jean-Marie-Eugène Lemasle, M.E.P. (died) |
| Thasus | 1989.03.11 | Bishop Carl Schmidt (died) |
| Thaumacus | 1943.11.21 | Bishop Gustave-Georges-Arsène Vandaele, M.E.P. (died) |
| Thebæ | 1965.02.01 | Archbishop Angelo Rotta (died) |
| Thebæ Phthiotides | 1989.12.15 | Bishop Alfonso Höfer Hombach, C.M. (died) |
| Thennesus | 1971.10.16 | Bishop Primo Gasbarri (transferred) |
| Theodoropolis | 1957.11.07 | Bishop George Calavassy (died) |
| Theodosiopolis in Arcadia | 1967.09.12 | Archbishop Arrigo Pintonello (transferred) |
| Theodosiopolis in Armenia | 1964.02.22 | Bishop Horacio Arturo Gómez Dávila (transferred) |
| Thermus basilicæ | 1968.06.24 | Bishop Angelo Giuseppe Jelmini (died) |
| Thespiæ | 1971.08.29 | Bishop Luigi Civardi (died) |
| Thessalonica | 1967.06.26 | Cardinal Carlo Grano (transferred) |
| Thimida | 2020.12.12 | Bishop Victor Gnanapragasam, O.M.I. (died) |
| Thimida regia | 2019.02.16 | Bishop Florencio Armando Colín Cruz (70) (transferred) |
| Thizica | 2020.07.19 | Bishop Louis Dicaire (died) |
| Thmuis | 1964.08.10 | Bishop Pierre-Armand-Albert-Lucien Fallaize, O.M.I. (died) |
| Thois | 1966.11.21 | Bishop David Picão (transferred) |
| Thubunæ in Numidia | 2019.04.09 | Bishop Héctor Manuel Rivera Pérez (died) |
| Thuburbo minus | 2021.04.21 | Bishop Antonio Pepito Palang, S.V.D. (died) |
| Thucca in Mauretania | 2020.12.05 | Bishop Moon Han-lim (문한림) (66) (transferred) |
| Thyatira | 1991.10.28 | Bishop Myron Michael Daciuk, O.S.B.M. (transferred) |
| Tiberias | 1966.11.29 | Bishop Raffaele Macario (transferred) |
| Tiberiopolis | 1964.09.10 | Archbishop Adolfo Rodríguez Herrera (transferred) |
| Tipasa in Numidia | 2019.10.15 | Bishop Christian Riesbeck, C.C. (51) (transferred) |
| Titiopolis | 1967.03.15 | Bishop Pedro Francisco Luna Pachón, O.F.M. (died) |
| Tituli in Numidia | 2020.10.21 | Bishop Moacir Silva Arantes (52) (transferred) |
| Tituli in Proconsulari | 2020.06.26 | Bishop Pierre-Antonio-Jean Bach, M.E.P. (died) |
| Tityassus | ? | |
| Tium | 1970.04.30 | Bishop Alfredo Maria Cavagna (died) |
| Tokat (Armenian Rite) | 2012.07.28 | Bishop Vartan Achkarian, C.A.M. (died) |
| Tongeren | 2019.06.05 | Bishop Pierre Warin (73) (transferred) |
| Tracula | 1966.12.25 | Bishop John van Sambeek, M. Afr. (died) |
| Traianopolis in Phrygia | 1967.05.05 | Bishop Humberto Lara Mejía, C.M. (transferred) |
| Traianopolis in Rhodope | 1968.01.12 | Archbishop Albert-Pierre Falière, M.E.P. (died) |
| Tralles in Asia | 1974.08.21 | Bishop Emanuele Galea (died) |
| Tralles in Lydia | 1933 | |
| Transmarisca | 1933 | |
| Trapezopolis | 1990.03.14 | Bishop Ioan Ploscaru (transferred) |
| Trapezus | 1969.07.16 | Archbishop Carlo Alberto Ferrero di Cavallerleone (died) |
| Trapezus (Armenian Rite) | 2002.01.28 | Bishop Hovhannes Tertsakian, C.A.M. (died) |
| Treba | 2020.10.22 | Bishop Thomas Dowd (50) (transferred) |
| Trebenna | 1966.04.04 | Archbishop Paul Francis Leibold (transferred) |
| Tremithus | 1966.01.03 | Bishop Cândido Rubens Padín, O.S.B. (transferred) |
| Tricala | 2018.11.12 | Bishop Carlos Briseño Arch, O.A.R. (60) (transferred) |
| Tricca | 1966.05.16 | Bishop Robert Costanzo Lagae, O.P. (died) |
| Tripolis in Lydia | 1933 | |
| Tripolis in Phœnicia | 1889.12.14 | Archbishop Alessandro Grossi (transferred) |
| Trisipa | 2019.09.28 | Bishop Gérard Tremblay, P.S.S. (died) |
| Troas | 1971.01.23 | Bishop Joseph-Alphonse Baud, M.S.F.S. (resigned) |
| Trocmades | 1968.08.14 | Bishop Karol Pekala (died) |
| Trofimiana | 2019.03.05 | Bishop Joseph Vincent Brennan (67) (transferred) |
| Trœzene | 1933 | |
| Tubernuca | 2020.12.23 | Bishop Rubén Tierrablanca Gonzalez, O.F.M. (died) |
| Tusuros | 2020.05.06 | Bishop Amilton Manoel da Silva, C.P. (58) (transferred) |
| Tyana | 1975.08.03 | Archbishop Primo Principi (died) |
| Tymandus | 1933 | |
| Tymbrias | 1967.11.04 | Bishop Henry Edmund Donnelly (died) |
| Tyriæum | 1984.10.27 | Bishop Angel Muzzolón, S.D.B. (died) |
| Tyrus | 1984.05.31 | Archbishop Bruno Wüstenberg (died) |
| Tzernicus | 2020.11.21 | Bishop Jožef Smej (died) |
| Ubaza | 2019.10.30 | Bishop Francis Xavier Irwin (died) |
| Ulcinj | 2015.05.07 | Bishop Józef Pazdur (died) |
| Urima | 1966.11.15 | Archbishop Johannes Höhne, M.S.C. (transferred) |
| Urusi | 2018.06.28 | Cardinal Aquilino Bocos Merino, C.M.F. (83) (transferred) |
| Utimmira | 2019.09.28 | Bishop Andrés Vargas Peña (74) (transferred) |
| Uzalis | 2020.11.11 | Bishop Devair Araújo da Fonseca (53) (transferred) |
| Vadesi | 2019.09.28 | Bishop Adolfo Miguel Castaño Fonseca (58) (transferred) |
| Valentia | 1933 | |
| Vamalla | 2013.09.25 | Bishop Timothy Joseph Lyne (died) |
| Vannida | 2021.04.10 | Archbishop Félix del Blanco Prieto (died) |
| Vartana | 2018.10.16 | Archbishop Giovanni Moretti (died) |
| Vasada | 1980.05.04 | Bishop Johann Wember, M.S.F. (died) |
| Vassinassa | 2020.10.20 | Bishop Bogdan Józef Wojtuś (died) |
| Vatarba | 2019.05.15 | Bishop Peter Baldacchino (60) (transferred) |
| Vazari | 2019.10.31 | Bishop Walter Jehová Heras Segarra, O.F.M. (57) (transferred) |
| Velia | 2020.06.06 | Bishop Andrea Veggio (died) |
| Velicia | 1968.06.19 | Bishop Eduard Nécsey (died) |
| Verbe | 2020.10.24 | Patriarch Pierbattista Pizzaballa, O.F.M. (56) (transferred) |
| Verinopolis | 1982.11.22 | Cardinal Serafim Fernandes de Araújo (transferred) |
| Verissa | 1965.03.25 | Archbishop Felício César da Cunha Vasconcellos, O.F.M. (transferred) |
| Vico Equense | 2021.06.24 | Archbishop Alain Paul Charles Lebeaupin (died) |
| Vicus Turris | 2019.03.10 | Bishop René Arnold Valero (died) |
| Voncaria | 2018.08.13 | Bishop Santiago María García de la Rasilla Domínguez, S.J. (died) |
| Xanthe | 1933 | |
| Xanthus | 2003.03.18 | Archbishop Bruno Bernard Heim (died) |
| Xois | 1933 | |
| Zabulon | 1727.04.01 | Bishop Louis Champion de Cicé, M.E.P. (died) |
| Zagylis | 1933 | |
| Zaliche | 1990.04.30 | Bishop Gustavo Posada Peláez, M.X.Y. (transferred) |
| Zapara | 1976.06.03 | Bishop Juan Nicolasora Nilmar (transferred) |
| Zaratovium | 1933 | |
| Zarna | 2020.04.22 | Bishop Francisco Antonio Ceballos Escobar, C.SS.R. (63) (transferred) |
| Zarzela | 1933 | |
| Zela | 1964.07.07 | Archbishop José María García Lahiguera (transferred) |
| Zenobias | 2004.09 | Bishop Andraos Abouna (transferred) |
| Zenopolis in Isauria | 2010.12.20 | Archbishop Giovanni Ferrofino (died) |
| Zenopolis in Lycia | 1933 | |
| Zephyrium | 1966.07.26 | Archbishop André Charles Collini (transferred) |
| Zeugma in Mesopotamia | 1933 | |
| Zeugma in Syria | 2020.11.18 | Bishop Iwannis Louis Awad (died) |
| Zoara | 2001.08.25 | Bishop Wacław Skomorucha (died) |
| Zorolus | 1979.03.01 | Bishop Kazimierz Jan Majdański (transferred) |
| Zygana | 1933 | |
