| O'Brien, Randy |
| Oak, Nikita Umakant |
| Obaldo, Leonard Ganir |
| Oberez, Arnel Tanola |
| Ocay, Barry Teatro |
| Ochola, Ageno |
| Octaviano, Mary Grace P. |
| Odhiambo Lameck Odeck |
| Odszuck, Jürgen |
| Oduori, Moses Frank |
| Oei, Fuk-Jin |
| Oey, Elia |
| Ofren, Rey S. |
| Ogawa, Yoshiko |
| Ogli, Khalilov Kamran Chingiz |
| Oglu, Mehdiyev Magsud Telman |
| Oguis, Nestor L. |
| Oh, Keum-ho |
| Ohira, Wataru |
| Ohmar Thwin |