Participants
| Peggy Oti-Boateng | Ghana |
| Carol O'Donnell | United States of America |
| Mairead O'Driscoll | Ireland |
| Andrea Obaid | Chile |
| Edwin Obaje | Nigeria |
| Ferenc Oberfrank | |
| Amanda Obidike | Nigeria |
| Kazuyoshi Ohnuma | Japan |
| Iretimide Ojuekaiye | Nigeria |
| Eyitayo Olakanmi | Nigeria |
| Kayode Olawoyin | Nigeria |
| Teresa A. Oliveira | Portugal |
| Adebayo Olukoshi | Nigeria |
| Dickens Ondigo | Kenya |
| Mung-i Eunice Ong | France |
| H.E. Hikariko Ono | Japan |
| Justina Onumah | Ghana |
| Rowland Opisa | Kenya |
| Leonardo Orlando | Spain |
| Ferenc Orosz | Hungary |
| Eduardo Ortega Barria | Panama |
| Azeez Oseni | Nigeria |
| Hossam Eldin Osman | Egypt |
| David Ouko | Kenya |
| Daniela Ovadia | Italy |
| Nurul Hasnat Ove | Bangladesh |
| Walter Oyawa | Kenya |