Author
- Porcellio1
- Porphyry1
- Priori (Florence)1
- Priscian1
- Pseudo-Phalaris1
- Ptolemaeus Tancredius1
- Ptolemy1
- Qadi Ayyad1
- Qasem-e Anvar1
- Raghudeva Nyāyālaṅkāra1
- Ramon Llull1
- Raymond of Penyafort1
- Raymond of Sabunde1
- Richard Burdet1
- Richard II of England1
- Richard Ward1
- Robert Cooke1
- Robert de Saint-Martin1
- Rodolfo Pio da Carpi1
- Roman Catholic Archdiocese of Mainz1