| Ready aye ready | |
| Regi patriaque fidelis | |
| Rex vocat | |
| Sagittari | |
| Sanitas in ore | | Oral health (L.) |  | RCDC | |
| Sans peur | |
| Securitas | |
| Semper alacer | | Always swift (L.) |  | SALH | |
| Semper fidelis | |
| Semper paratus | |
| Semper vigilantes | |
| Septem iuncta in uno | |
| Servire armatis | | Serve the soldier (L.) |  | RCPC | |
| Servitium nulli secundus | |
| Siol na fear fearail | |
| Si sisit prudentia | |
| Spectamur agendo | |
| Spectemur agendo | |
| Spem reduxit | | Hope returns (L.) |  | RNBR | |
| Steady | |
| Sua tela tonanti | | His missiles thundering (L.), but in RAOC translated as "To the warrior his arms" |  | RAOC | |
Suaviter in modo, fortiter in re | | Gentle in manner, resolute in deed (L.) |  | WRAC | |
| Sub cruce candida | | Under the white cross (L.) |  | QARANC | |
| Toujours prêt | |
| Treu und Fest | |
Tria iuncta in uno (Tria juncta in uno) | |
| Truth, duty, valour |  | Royal Military College | |
| Ubique | | Everywhere (L.), meaning that the artillery and engineers have served everywhere the army has been, too many places to name in battle honours |  | RA, RE |  | RCA |  | RAA |  | RNZA | |
| Ubique honor et equis | |
| Ullamh | |
| Unconquered I serve | |
| Ut irruant omnes | | Aggressive in attack (L.) |  | ManMR | |
| Utrinque paratus | | Ready for anything (L.) |  | Para | |
| Vel exuviae triumphant | |
| Velox, versutus, vigilans | | Swift, skilled, alert (L.) |  | RCSigs | |
| Veni et vici | |
| Vestigia nulla retrorsum | |
| Veteri frondescit honore | | Ever green with ancient honour (L.) |  | Buffs | |
| Vigilans | |
| Viret in aeternum | |
| Virtus in arduis | |
| Virtutis fortuna comes | |
| Volens et valens | |
| Vota vita mia | | My life is devoted (L.) |  | KCH | |
| Watch the front, watch weel | |
| We sustain | |
| Whakatangata kia kaha | |
| Where duty leads | |
| Who dares wins | |