H
| Class | Country | Type | Launch years | Displacement (tons) | Number |
| H | Denmark | submarine | 407 | 4 | |
| Halcyon | UK | minesweeper | 1,330 | 21 | |
| Hatsuharu | Japan | destroyer | 1932-34 | 1,490 | 6 |
| Hawkins | UK | heavy cruiser | 1917-21 | 9,860 | 5 |
| Hipper: short name for Admiral Hipper | Germany | heavy cruiser | 1937-39 | 14,247 | 3 completed |
| Hiyo | Japan | aircraft carrier | 24,140 | 2 | |
| Hunt | UK | destroyer escort | 1939-43 | 1,000-1,170 | 86 |
Read more about this topic: List Of World War II Ship Classes