Antarctique
Îles commençant par o
- O. Kocebu, ostrov
- O'Brien, Isla
- Obrivistyj Island
- Observation Island
- Observatorio, isla
- O'Connor Island
- Odbert Island
- Odd I-revet
- Oddenskjera
- Oeste, arrecife
- Ohlin Island
- Ojo, islote
- Oldham Island
- Oldroyd Island
- Oliphant Islands
- Oliver Island
- Olson Island
- Omega Island
- Omicron Islands
- Ommundsen Island
- Ondori Island
- Ongley, Isla
- Ongul Island
- Ongul Oki-no-sima
- Ongul Syotô
- Ongulgalten
- Ongulkalven Island
- Ongulknappen
- Ono Jima
- Onoe Jima
- Oom Island
- Orca, islotes
- Orcadas del Sur, islas
- Orejas De Burro, Islas
- Orne Islands
- Ornen, Rocas
- Orr Island
- Orrego Vicuña, Islotes
- Ortiz Island
- Osmar Island
- Osøya
- Ouellette Island
- Outcast Islands
- Outer Island
- Outlaw Rock
- Owen, Isla
- Owston, islotes
- Oyako Zima
- Oyayubi Island
- Øygarden