Y
| Ship | Country | Class and type | Displacement (tons) | First commissioned | Fate |
| Yahagi | Japan | Agano class light cruiser | 6,650 | 29 December 1943 | sunk 7 April 1945 |
| Yakov Sverdlov | USSR | Novik class destroyer | 1,260 | 1913 (as Novik, renamed Yakov Sverdlov 1923) | sunk 28 August 1941 |
| Yakumo | Japan | armored cruiser | 9,646 | 20 June 1900 | scrapped 1 April 1947 |
| Yamashiro | Japan | FusÅ class battleship | 39,154 | 31 March 1917 | sunk 25 October 1944 |
| Yamato | Japan | Yamato class battleship | 74,170 | Dec 1941 | sunk 7 April 1945 |
| Yat Sen | China | gunboat | 1,650 | became Atada (Japan) | |
| Ying Swei | China | Chao Ho class cruiser | 2,460 | ca.1911 | Sunk 25 October 1937 |
| Yorktown (CV-5) | USA | Yorktown class aircraft carrier | 19,900 | 30 September 1937 | sunk 7 June 1942 |
| Yorktown (CV-10) | USA | Essex class aircraft carrier | 30,800 | 15 April 1943 | decommissioned 27 June 1970, museum ship Charleston, South Carolina |
| Yubari | Japan | light cruiser | 2,890 | 1923 | sunk 27 April 1944 |
| Yukikaze | Japan | Kagero class destroyer | 2,490 | ca.1940 | to China 1947, renamed Tan Yang |
| Yura | Japan | Nagara class light cruiser | 5,088 | 1922 | lost 25 October 1942 |
Read more about this topic: List Of World War II Ships