Author
- Rajab al-Bursi2
- Raphael Berdugo2
- Rashid-al-Din Hamadani2
- Regiomontanus2
- Remigius of Auxerre2
- Ressani family2
- Richard de Saint-Laurent2
- Richard of Middleton2
- Riyazi2
- Rodrigo Sánchez de Arévalo2
- Royal Chancellery of Granada2
- Rutilius Taurus Aemilianus Palladius2
- Rāmacandrabhaṭṭa2
- Rāmakr̥ishṇa Bhaṭṭa2
- Rāmānandasarasvatī2
- Sabit Alaeddin Ali2
- Safi Al-Din Al-Hilli Altaie2
- Safi al-Din al-Urmawi2
- Salamah ben Musa ben Yitsḥaḳ2
- Samuel ben Hofni2