| Name | Class | Country | Year of Launch |
| O (Planned)  | M-class Light Cruiser  | Germany  | 1945 (Projected, not actual)  |
| O (Planned)  | O-class Battlecruiser  | Germany  | 1941 (Projected, not actual)  |
| O (Planned)  | M-class Light Cruiser  | Germany  | 1943 (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  |   |
| 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  |
| Otto Wünsche  | Otto Wünsche-class Submarine Tender  | Germany  | 1940  |
| Oyodo  | Oyodo-class Light Cruiser  | Japan  | 1942  |
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