Author
- Ramon Llull1
- Rashid-al-Din Hamadani1
- Raymond of Penyafort1
- Raymond of Sabunde1
- Regiomontanus1
- Reynoldus Romanus1
- Richard de Fournival1
- Robert de Saint-Martin1
- Roberto Caracciolo1
- Roman Catholic Archdiocese of Mainz1
- Roman Catholic Diocese of Zaragoza1
- Rutilius Taurus Aemilianus Palladius1
- Ruzbihan Baqli1
- Saadia Gaon1
- Sacro Regio Consiglio1
- Safi al-Din al-Urmawi1
- Saʻīd Najm al-Dīn ʻAjamī1
- Seifrit1
- Seneca1
- Shams al-Dīn al-Samarqandī1