- Olusola Muhammad
- Oluwatoyin Ade-Odutola
- Oluwole Onemola
- Olympe Bhêly-Quenum
- Omanza Eugene Shaw
- Omar Agustin Hernandez
- Omar Ali Ewado
- Omar Aziki
- Omar Benderra
- OMCT
- Omékongo wa Dibinga
- Omer Hussein Dualeh
- Omme Rahemtullah
- Omobolaji Olarinmoye
- Omowale Kefing
- Omoyemen Odigie-Emmanuel
- Omunga
- Omunga - Angola
- Omunga Angola
- Ondjaki
- Onitaset Kumat
- ONU
- Onwubiko Agozino
- Onyango Oloo
- Onyeka Obasi
- Onyekachi Wambu
- Open letter to the Commissioner of Police
- Open Society Foundation
- Open Society Foundations
- OPEN SOCIETY INITIATIVE FOR WEST AFRICA (OSIWA)