Author
- Regiomontanus1
- Remigio dei Girolami1
- Reynoldus Romanus1
- Richard II of England1
- Richard Nykke1
- Richard of Middleton1
- Robert de Saint-Martin1
- Roberto Caracciolo1
- Rocca, Antonio1
- Rodrigo Sánchez de Arévalo1
- Roger Waltham1
- Rozanes, Yosef, 15th century1
- Rutilius Taurus Aemilianus Palladius1
- Ruzbihan Baqli1
- Saadi1
- Saadia Gaon1
- Safi Al-Din Al-Hilli Altaie1
- Samuel Marochitanus1
- Saʻīd Najm al-Dīn ʻAjamī1
- Sebastian of Naples1