Author
- Oronce Finé1
- Osman bin Keskin1
- Ottavio Strada1
- Ovid1
- Panini1
- Paolo da Firenze1
- Pappus of Alexandria1
- Paramahaṃsa Vrājakācārya1
- Paraśurāma1
- Paschualis Bernardus1
- Patrick Graham, 1st Lord Graham1
- Paul IV1
- Paul of Aegina1
- Paul of Pergula1
- Paul, of Cologne1
- Pedanius Dioscorides1
- Pedro Barrantes Maldonado1
- Pedro Henrique de Bragança1
- Pedro Juan Núñez1
- Pedro de Menezes, 1st Count of Vila Real1