| Name | Class | Country | Year of Launch |
| O (Planned) | M-class Light Cruiser | Germany | 1945 (Projected, not actual) |
| O (Planned) | M-class Light Cruiser | Germany | 1943 (Projected, not actual) |
| O (Planned) | O-class Battlecruiser | Germany | 1941 (Projected, not actual) |
| O'Brien | Sims-class Destroyer | United States | 1939 |
| O2 (Planned) | M2-class Light Cruiser | Germany | 1947 (Projected, not actual) |
| 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 | |
| Onice | Perla-class Submarine | Italy | |
| Oregon | Indiana-class Battleship | United States | 1893 |
| Orion | No Classification | Germany | 1930 |
| Orzel | Orzel-class Submarine | Poland | 1938 |
| Oshio | Asashio-class Destroyer | Japan | |
| Ostmark | No Classification | Germany | 1936 |
| Otaria | Glauco-class Submarine | Italy | |
| Otto Wünsche | Wilhelm Bauer-class Submarine Tender | Germany | 1940 |
| Oyodo | Oyodo-class Light Cruiser | Japan | 1942 |
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Citação Famosa da 2ª GM
"Goddam it, you'll never get the Purple Heart hiding in a foxhole! Follow me!"Captain Henry P. Jim Crowe, Guadalcanal, 13 Jan 1943
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