lacs
| Nom | Type | Notoriété | Popularité |
|---|---|---|---|
| Olympia Planum | Relief | 5 | 0.2 |
| Omacatl Macula | Relief | 3 | 0.1 |
| Omalós | Relief | 4 | 0.6 |
| Ombilic Glaciaire | Relief | 22 | 6.3 |
| Omeciuatl Corona | Relief | 2 | 0.0 |
| Omosi-mama Corona | Relief | 3 | 0.0 |
| Omutnitsa Vallis | Relief | 2 | 0.2 |
| Onatah Corona | Relief | 6 | 0.0 |
| One Tree Point | Relief | 3 | 0.0 |
| Oneida Lacus | Relief | 5 | 0.2 |
| Onenhste Corona | Relief | 2 | 0.0 |
| Onkivesi | Lac | 13 | 0.0 |
| Ontario Lacus | Relief | 24 | 0.4 |
| Ontario Place | Relief | 8 | 0.0 |
| Ontojärvi–nurmesjärvi | Lac | 8 | 0.0 |
| Opelt | Relief | 15 | 0.0 |
| Ophir Chasma | Relief | 9 | 0.2 |
| Ophir Planum | Relief | 4 | 0.2 |
| Oppius | Relief | 17 | 3.0 |
| Oppstrynsvatnet | Lac | 12 | 0.6 |
| Ops Corona | Relief | 3 | 0.0 |
| Orbona Corona | Relief | 2 | 0.0 |
| Orbán-hegy | Relief | 5 | 0.2 |
| Orchard Lake | Lac | 5 | 0.0 |
| Orcococha | Lac | 6 | 0.0 |
| Orcus Patera | Relief | 13 | 0.7 |
| Oresme | Relief | 13 | 0.2 |
| Orgues D'ille-sur-têt | Relief | 4 | 30.0 |
| Orjen | Relief | 20 | 1.2 |
| Orkach | Lac | 8 | 0.0 |
| Orlické Hory | Relief | 20 | 1.0 |
| Ormajärvi | Lac | 5 | 0.0 |
| Ormholet | Relief | 4 | 0.0 |
| Orontius | Relief | 15 | 0.0 |
| Orrdalsklint | Relief | 18 | 0.8 |
| Osen Korogashi | Relief | 5 | 0.0 |
| Oshtorankuh | Relief | 10 | 0.0 |
| Osiris | Relief | 5 | 0.0 |
| Osman Sagar | Lac | 11 | 0.7 |
| Osogovo | Relief | 28 | 0.3 |
| Ossiacher See | Lac | 25 | 0.7 |
| Osterfelderkopf | Relief | 7 | 0.0 |
| Osterseen | Relief | 8 | 0.8 |
| Ostwald | Relief | 13 | 0.3 |
| Otafuku Tholi | Relief | 3 | 0.1 |
| Otake | Relief | 5 | 0.1 |
| Otau Corona | Relief | 3 | 0.0 |
| Otepää Valgjärv | Lac | 12 | 0.0 |
| Otohime Tholus | Relief | 3 | 0.2 |
| Ottermeer | Lac | 4 | 0.0 |