Author
- Raghunātha2
- Rashid-al-Din Hamadani2
- Regiomontanus2
- Remigius of Auxerre2
- Ressani family2
- Richard de Saint-Laurent2
- Richard of Middleton2
- Riyazi2
- Royal Chancellery of Granada2
- Rutilius Taurus Aemilianus Palladius2
- Rāmacandrabhaṭṭa2
- Rāmakr̥ishṇa Bhaṭṭa2
- Rāmānandasarasvatī2
- Sabit Alaeddin Ali2
- Sadr al-Din al-Qunawi2
- Safi al-Din al-Urmawi2
- Satyāṣāḍha2
- Selim I2
- Serapion the Younger2
- Shaikh Inayat Allah Kamboh2