| Name | Class | Country | Year of Launch |
| J (Planned) | H-class Battleship | Germany | 1941 (Projected, not actual) |
| Jack | Gato-class Submarine | United States | |
| Jaguar | 1924-class Motor Torpedo Boat | Germany | 1928 |
| Jallao | Balao-class Submarine | United States | |
| Jean Bart | Richelieu-class Battleship | France | 1940 |
| Jean de Vienne | La Galissonnière-class Light Cruiser | France | 1935 |
| Jeanne d'Arc | Jeanne d'Arc-class Light Cruiser | France | |
| Jintsu | Sendai-class Light Cruiser | Japan | 1923 |
| Johnston | Fletcher-class Destroyer | United States | 1943 |
| Juneau | Atlanta-class Light Cruiser | United States | 1941 |
| Junyo | Hiyo-class Escort Carrier | Japan | 1941 |
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