| Surname | Name(s) | Club | Country | |
|---|---|---|---|---|
| Obama Aloa | Jose Vicky | Vitória Guimarães | Portugal | |
| Obekop | Marius | New York RB | United States | |
| Obele Mba | Joel Stephane | Krka | Slovenia | |
| Ogolong | Sem | Nocerina | Italy | |
| Ohandza Zoa | Frank | Iraklis Psachna | Greece | |
| Olinga | Fabrice | Zulte-Waregem | Belgium | |
| Ollo N'Doumba | Patrice | Oulu | Finland | |
| Omgba Opono Edoa | Emmanuel Franck | Elche II | Spain | |
| Omog | Joseph Marius | Léopards de Dolisié | Congo | |
| Ondoa Ebogo | Joseph Fabrice | FC Séville, Espagne | Spain | |
| Ongfiang | Franck Olivier | Sriwijaya | Indonesia | |
| Onguene | Frank Michel | Sektzia Nes Tziona | Israel | |
| Otobong | Ene Edet Otudor | Misr Lel Makasa | Denmark | |
| Oumarou | Aboubakar | Waasland-Beveren | Belgium | |
| Overtoom | Willie | AZ | Netherlands | |
| Owona | Dieudonné | Maccabi Umm Al Fahm | Israel | |
| Owona Ndong | Lucien Fridolin | Arroyo | Spain | |
| Owono Ngongo | Samuel | Bahrain | ||
| Owoundi | Bertrand | RC Arba | Algeria | |
| Oyongo Bitolo | Ambroise | New York RB | United States |
