C
| Class | Country | Type | Launch years | Displacement (tons) | Number |
| C | Denmark | submarine | 369 | 3 | |
| C | UK | light cruiser | 1916-18 | 4000 | 32 |
| Ca | UK | destroyer | 1943-44 | 1,710 | 8 |
| Cachalot | US | submarine | 1,100 | 2 | |
| Caledon | UK | light cruiser | 1916-17 | 4,180 | 3 |
| Cannon | US | destroyer escort | 1943-44 | 1525 tons | 72 |
| Capetown = Carlisle | UK | light cruiser | 1917-18 | 4,290 | 5 |
| Captain | UK | frigate | 1942-43 | 1,500 | 78 |
| Capitani Romani | Italy | light cruiser | 1940-42 | 3,686 | 3 (12 planned) |
| Casablanca | US | escort aircraft carrier | 7,800 | 50 | |
| Castle | UK | corvette | 1,060 | 44 | |
| Cavendish = Hawkins | UK | heavy cruiser | 1917-21 | 9,860 | 5 |
| Ceres class | UK | light cruiser | 1917 | 4,290 | 5 |
| Chacal = 2100 tonnes = Jaguar |
France | destroyer | 1924 | 2,126 | 6 |
| Ceylon = Uganda; sub-class of Crown Colony | UK | light cruiser | 1941-42 | 8,530 | 3 |
| Ch, Co & Cr | UK | destroyer | 1944-45 | 1,825 | 24 |
| Chang Ning | Republic of China | patrol boat | 400 | 10 | |
| Clemson | US | destroyer | 1918-21 | 1,190 | 156 |
| Cleveland class | US | light cruiser | 1941-46 | 11,744 | 38 |
| Colony; = Tacoma | UK | frigate | 1,400 | 21 | |
| Colorado | US | battleship | 1920-21 | 32,600 | 4 |
| Colossus | UK | light aircraft carrier | 1943-44 | 13,200 | 10 |
| Commencement Bay | US | escort aircraft carrier | 10,900 | 11 | |
| Condottieri; comprising five sub-classes - Di Giussano, Cadorna, Duca d'Aosta, Duca degli Abruzzi & Montecuccoli | Italy | light cruiser | 1930-35 | 5,110-8,610 | 12 |
| Conte di Cavour | Italy | battleship | 1911 | 23,600 | 2 |
| County | UK | heavy cruiser | 1926-31 | 8,250 - 10,900 | 13 |
| Courbet | France | battleship | 1911-12 | 23,200 | 2 |
| Crown Colony: comprising sub-classes Fiji and Ceylon | UK | light cruiser | 1939-43 | 8,530 | 11 |
| Currituck | US | seaplane tender | 1943-44 | 14,000 | 4 |
Read more about this topic: List Of World War II Ship Classes