T
| Class | Country | Type | Launch years | Displacement (tons) | Number |
| T1 = Type 1935 | Germany | torpedoboat | 1937-39 | 844 | 12 |
| Tachibana | Japan | destroyer | 1919-22 | 1,289 | 14 completed |
| Tacoma | US | frigate | 1,400 | 96 | |
| Takao | Japan | heavy cruiser | 1930-31 | 9,850 | 4 |
| Taiyō | Japan | escort aircraft carrier | 1939-40 | 20,000 | 3 |
| Tambor | US | submarine | 1,475 | 12 | |
| Tench | US | submarine | 1,826 | 31 completed | |
| Tennessee | US | battleship | 33,000 | 2 | |
| Ticonderoga | US | aircraft carrier | 27,200 | 13 | |
| Tjerk Hiddes | Netherlands | destroyer | 1939-40 | 1,316 | 1 completed (4 laid down) |
| Tomozuru | Japan | torpedoboat | 1933 | 535 | 4 |
| Tone | Japan | heavy cruiser | 1937-38 | 11,215 | 2 |
| Tordenskjold | Norway | coastal battleship | 3,852 | 2 | |
| Town: 3 sub-classes: Southampton, Gloucester and Edinburgh | UK | light cruiser | 1936-38 | 9100-10,550 | 10 |
| Town | UK | destroyers | 1917-19 | 1,020-1,190 | 43 |
| Trad | Siam | torpedoboat | 1935-37 | 262 | 9 |
| Treasury | US | USCG high endurance cutter | 1936-37 | 2,700 | 7 |
| Trento | Italy | heavy cruiser | 1926-32 | 10,511-10,890 | 3 |
| Tribal | UK | destroyer | 1937–1946 | 1,854-1,927 | 27 |
| Tromp | Netherlands | light cruiser | 1937-39 | 3,450 | 2 |
| Trygg | Norway | torpedo boat | 1919 (approx) | 220 | 3 |
| Type I | Germany | submarine | 2 | ||
| Type II | Germany | submarine | 300 | 50 | |
| Type VII | Germany | submarine | 1935-44 | 626-1084 | 743 |
| Type IX | Germany | submarine | 1032-1616 | 193 | |
| Type 1935 = T1 | Germany | torpedoboat | 1937-39 | 844 | 12 |
| Type 1937 | Germany | torpedoboat | 1938-40 | 9 |
Read more about this topic: List Of World War II Ship Classes