| Full name | Number of papers |
|---|---|
| José Antonio Ocampo | 1 |
| Nobuyuki Oda | 1 |
| Geum Wha Oh | 1 |
| Gyutaeg Oh | 1 |
| Junggon Oh | 2 |
| Kap-Soo Oh | 1 |
| Michael Ojo | 1 |
| Martin Oksbjerg | 1 |
| Ryoichi Okuma | 2 |
| Olorunsola E Olowofeso | 1 |
| Kjetil Olsen | 1 |
| Øystein Olsen | 20 |
| Marzunisham Omar | 1 |
| Dato' Ooi Sang | 2 |
| Robert Ophèle | 1 |
| David G Opiokello | 1 |
| Miguel Fernández Ordóñez | 32 |
| Yoshiharu Oritani | 1 |
| Athanasios Orphanides | 5 |
| Alvaro Ortiz | 1 |
| Guillermo Ortiz | 1 |
| Luís Otávio Reiff | 1 |
| Pascual O`Dogherty | 1 |
| Maureen O`Hara | 1 |
| Mary O`Rourke | 1 |
