Author
- Nārāyaṇāśrama1
- Nīlakaṇṭha Sarasvatī1
- Oddo di Biagio1
- Okçuzade Mehmet Sahî1
- Oliver Maillard1
- Onasander1
- Orosius1
- Osman Süruri1
- Osman bin Keskin1
- Otto of Passau1
- Pacholo Falconieri1
- Panormitanus1
- Paramahaṃsa Parivrājaka1
- Paramahaṃsa Vrājakācārya1
- Paramaśivāśrama1
- Paraśurāma1
- Paschasius Radbertus1
- Paul III1
- Paul IV1
- Paul of Aegina1