| Ornuma Thongniramol |
| Ortega, Edgar Montejo |
| Ortigas, Glenn M. |
| Ortigas, Noel M. |
| Ortinero, Cesar |
| Oruthota, O. A. Udesh Sanjika |
| Orwanya Vichailak |
| Osabel, Dave Montellano |
| Osman, Buntar |
| Ossor, Abdellatif |
| Osti, Krishna Prasad |
| Othman, Abdul Aziz |
| Othman, Muhammad Akhir Bin |
| Otiti, Jerome |
| Otman, Abdulrahman |
| OU Chouly |
| Ou, Lien-wei |
| Ou, Wen-chieh |
| Oudomsack Philavong |
| Ouk Chansopheap |