R
| Class | Country | Type | Launch years | Displacement (tons) | Number |
| R | US | submarine | 1918–1919 | 570 | 27 |
| Rainbow | United Kingdom | submarine | 1930 | 2,000 | 6 |
| Regele Ferdinand | Romania | destroyer | 1928-29 | 1,400 | 2 |
| Renown | UK | battlecruiser | 1916 | 32,000 | 2 |
| Revenge = Royal Sovereign | UK | battleship | 1914-16 | 28,000 | 5 |
| Richelieu | France | battleship | 1939-40 | 35,000 | 2 completed |
| River | UK | frigate | 1941–1944 | 1,400 | 151 |
| Royal Sovereign = Revenge | UK | battleship | 1914-16 | 28,000 | 5 |
| Rudderow | US | destroyer escort | 1943-44 | 1,430 | 22 completed |
| Ruler: = Bogue | UK | escort aircraft carrier | 16,000 | 24 |
Read more about this topic: List Of World War II Ship Classes