Author
- Pseudo-Jerome1
- Qutb al-Din Razi1
- Rafaino Caresini1
- Ralph of Longchamp1
- Rashi1
- Rashid-al-Din Hamadani1
- Republic of Venice1
- Richard Maidstone1
- Richard Rolle1
- Richard of Middleton1
- Robert Holkot1
- Robert Kilwardby1
- Robert de Sorbon1
- Robert of Gloucester1
- Roffredo Epifanio1
- Sadr al-Shari'a al-Asghar1
- Salomon ibn Parhon1
- Saʻīd Najm al-Dīn ʻAjamī1
- Sensatus1
- Serapion the Younger1