List of Mars craters / O
| Surname | Named after | location | Mean diameter (km) |
|---|---|---|---|
| Ocampo | Ocampo , city in Mexico | 32.7 ° N 138.2 ° E |
7.1 |
| Ohara | Ohara , city in Japan | 4.9 ° N 82.4 ° E |
10.8 |
| Orson Welles | Orson Welles , American film director, actor, and writer | 0.19 ° S 314.1 ° E |
115.99 |