OT

OT or Ot may refer to:

Media

Operación Triunfo, a format for a Spanish reality-show talent contest
Operation Transformation (TV series), an Irish health and fitness programme
OT: Our Town, a 2002 documentary film about a high school in Compton, California that stages Thornton Wilder's Our Town

Old Testament
Operating Thetan, in Scientology, a spiritual state of a being able to operate free of the encumbrances of the material universe
Ot Ene, the Mongolian goddess of marriage
Ordinary Time a Liturgical season in the Roman Catholic Church

Oblivious transfer, a type of cryptography protocol
OpenType, a format for scalable computer fonts
Operational Technology, hardware/software technology dedicated to physical assets in the enterprise
Operational transformation, an optimistic concurrency control method for group editing
Optical tweezers, instruments used to hold and move microscopic dielectric objects
Optimality theory, a linguistic model
Overshooting top, a protuberance above the anvil of some thunderstorms where an intense updraft penetrates the stable layer near the tropopause
Oxytocin, a mammalian hormone

Occupied Territories
Armoured personnel carrier (Czech: [Obrněný Transportér] Error: {{Lang}}: text has italic markup (help))
- OT-62 TOPAS, a series of tracked armoured vehicles
- OT-64 SKOT, a series of 8×8 armoured vehicles
- OT-65, a series of 4×4 Armoured Cars of Hungarian design similar to the BRDM-1
- OT-810, the Czech version of the Sd.Kfz. 251 half-track infantry combat vehicle

Ot (Cyrillic) (Ѿ, ѿ), a letter of the early Cyrillic alphabet
Off topic
Overtime, a designation indicating working past normal work hours
Aeropelican Air Services (IATA airline designator: OT)
Oberer Totpunkt, the German for top dead center of an internal combustion engine
Ortsteil (O/T), a section of an urban settlement in Germany
O-T map, type of medieval world map