Y
| Class | Country | Type | Launch years | Displacement (tons) | Number |
| Yamato | Japan | battleship | 1940 | 62,315 | 2 |
| York | UK | heavy cruiser | 1928-29 | 8,300 | 2 |
| Yorktown | US | aircraft carrier | 1936-40 | 23,000 | 3 |
| Yugumo | Japan | destroyer | 1941-44 | 2,077 | 20 |
Read more about this topic: List Of World War II Ship Classes