| Name | Class | Country | Year of Launch |
| R (Planned) | M-class Light Cruiser | Germany | 1945 (Projected, not actual) |
| R (Planned) | M-class Light Cruiser | Germany | 1943 (Projected, not actual) |
| R-1 | R-class Submarine | United States | 1918 |
| R-14 | R-class Submarine | United States | 1919 |
| R-3/P511 | R-class Submarine | United Kingdom | |
| R-5 | R-class Submarine | United States | 1918 |
| R-7 | R-class Submarine | United States | |
| R2 (Planned) | M2-class Light Cruiser | Germany | 1947 (Projected, not actual) |
| Raleigh | Omaha-class Light Cruiser | United States | |
| Rall | Evarts-class Destroyer Escort | United States | 1943 |
| Ralph Talbot | Bagley-class Destroyer | United States | 1936 |
| Randolph | Essex-class Aircraft Carrier | United States | 1944 |
| Ranger | Ranger-class Aircraft Carrier | United States | 1933 |
| Rasher | Gato-class Submarine | United States | |
| Raton | Gato-class Submarine | United States | |
| Rawalpindi | R-class Merchant Vessel | United Kingdom | 1925 |
| Ray | Gato-class Submarine | United States | 1943 |
| Razorback | Balao-class Submarine | United States | |
| Redfin | Gato-class Submarine | United States | |
| Redfish | Balao-class Submarine | United States | |
| Reginaldo Giuliani | Liuzzi-class Submarine | Italy | |
| Renown | Renown-class Battlecruiser | United Kingdom | |
| Renraku-tei-class Summary Information | Renraku-tei-class Motor Torpedo Boat | Japan | |
| Renshaw | Fletcher-class Destroyer | United States | 1942 |
| Repulse | Renown-class Battlecruiser | United Kingdom | |
| Resolution | Revenge-class Battleship | United Kingdom | |
| Reuben James | Clemson-class Destroyer | United States | 1919 |
| Richelieu | Richelieu-class Battleship | France | 1939 |
| Richthofen | Hans Albrecht Wedel-class Seaplane Tender | Germany | 1942 |
| Ro-58 | Type L3-class Submarine | Japan | 1922 |
| Robalo | Gato-class Submarine | United States | |
| Rock | Gato-class Submarine | United States | 1943 |
| Rodney | Nelson-class Battleship | United Kingdom | 1925 |
| Roma | Vittorio Veneto-class Battleship | Italy | 1940 |
| Roncador | Balao-class Submarine | United States | |
| Ronquil | Balao-class Submarine | United States | |
| Royal Sovereign | Revenge-class Battleship | United Kingdom | 1915 |
| Runner (Gato-class) | Gato-class Submarine | United States | 1942 |
| Runner (Tench-class) | Tench-class Submarine | United States | |
| Ryuho | Ryuho-class Aircraft Carrier | Japan | 1933 |
| Ryujo | Ryujo-class Aircraft Carrier | Japan | 1931 |
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Famous WW2 Quote
"All that silly talk about the advance of science and such leaves me cold. Give me peace and a retarded science."Thomas Dodd, late 1945
