G
| Class | Country | Type | Launch years | Displacement (tons) | Number |
| G and H | UK | destroyer | 1935-39 | 1,340-1,350 | 24 |
| Gabbiano | Italy | corvette | 1942 | 672 | 40 |
| Gangut | USSR | battleship | 1911 | 25,850 | 4 |
| Gato | US | submarine | 1,825 | 73 | |
| Gearing | US | destroyer | 1945-51 | 2,616 | 98 |
| Gleaves = Benson | US | destroyer | 1939-41 | 1,839 | 66 |
| Glorious | UK | aircraft carrier | 26,500 | 2 | |
| Gloucester sub-class of Town |
UK | light cruiser | 1937 | 9,100 | 3 |
| Gneisenau = Scharnhorst | Germany | battleship | 1936 | 31,840 | 2 |
| Gridley | US | destroyer | 1936-38 | 1,590 | 4 |
| Grom | Poland | destroyer | 1936 | 2,144 | 2 |
| Guépard = 2400 tonnes | France | destroyer | 1928-30 | 2,436 | 6 |
Read more about this topic: List Of World War II Ship Classes