Persons (1300 to 1324 of 1956)
| Name | Birth (min–max) | Death (min–max) | Related sources | Authored diagrams | |
|---|---|---|---|---|---|
| Ogiermann, Eva | 1 | 0 | |||
| Ojeda-Aciego, Manuel | 4 | 0 | |||
| Olmos, Ivan | 1 | 0 | |||
| Olsen, Elizabeth Grace | 1 | 0 | |||
| Ong, Walter J. | 1 | 0 | |||
| Oostra, Arnold | 1 | 0 | |||
| Oporinus, Johannes | 1 | 0 | |||
| Orbellis, Nicolaus de | 2 | 0 | |||
| Orciuoli, Francesco | 4 | 11 | |||
| Orenstein, Alex | 1936 | 2018 | 3 | 0 | |
| Oresme, Nicole | 3 | 0 | |||
| Ortiz, Didacus | 4 | 6 | |||
| Osorio, Mauricio | 1 | 0 | |||
| Otten, Petrus | 0 | 0 | |||
| Paasch, JT | 1 | 0 | |||
| Pabijutaitė, Živilė | 1 | 0 | |||
| Paganus, Theobaldus | 1 | 0 | |||
| Page, Martinus | 1761 | 3 | 3 | ||
| Pagnan, Ruggero | 3 | 3 | |||
| Palma, Silvia | 2 | 0 | |||
| Panger, Marinus | 1 | 2 | |||
| Papadopoulos, George | 1 | 0 | |||
| Papini, Odile | 1 | 0 | |||
| Papy, Jan | 1965 | 1 | 0 | ||
| Parent, Xavier | 1 | 0 |