| Name | Class | Country | Year of Launch |
| O'Brien | Sims-class Destroyer | United States | 1939 |
| Oberon | O-class Submarine | United Kingdom | 1926 |
| Oi | Kuma-class Light Cruiser | Japan | 1920 |
| Oklahoma | Nevada-class Battleship | United States | |
| Ommaney Bay | Casablanca-class Escort Carrier | United States | 1943 |
| Onami | Yugumo-class Destroyer | Japan | |
| Oregon | Indiana-class Battleship | United States | 1893 |
| Orion | No Classification | Germany | |
| Orzel | Orzel-class Submarine | Poland | 1938 |
| Oshio | Asashio-class Destroyer | Japan | |
| Oyodo | Oyodo-class Light Cruiser | Japan | 1942 |
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"With Germany arming at breakneck speed, England lost in a pacifist dream, France corrupt and torn by dissension, America remote and indifferent... do you not tremble for your children?"Winston Churchill, 1935
