Lieutenant and Sub Lieutenant
The exact rank is given on the envelope or in a list. These ranks should not be abbreviated.
How to Address a Lieutenant
The recommended social style of address is as follows:
| Beginning of letter | Dear Lieutenant Smith |
| End of letter | Yours sincerely |
| Envelope | Lieutenant John Smith, CBE, RN |
| Verbal communication | Lieutenant Smith* |
| Invitation | Lieutenant John Smith |
| Description in conversation | Lieutenant Smith |
| List of Directors or Patrons | Lieutenant John Smith |
| Place card | Lieutenant John Smith |
*A younger man, or a more junior officer in any of the Armed Forces, addresses him as 'Sir'.
How to Address a Sub Lieutenant
The recommended social style of address is as follows:
| Beginning of letter | Dear Mr Brown |
| End of letter | Yours sincerely |
| Envelope | Sub Lieutenant John Brown, RN (this rank should not be abbreviated) |
| Verbal communication | Mr Brown* |
| Invitation | Mr John Brown |
| Description in conversation | Mr Smith |
| List of Directors or Patrons | Mr John Brown |
| Place card | Mr John Brown |
*A younger man, or a more junior officer in any of the Armed Forces, addresses him as 'Sir'.
