Author
- Pseudo-Joachim of Fiore2
- Pseudo-Phalaris2
- Qara Emre2
- Qāsim ibn al-Faḍl2
- Rafīʻā, Muḥammad ibn Ḥaydar, 1588 or 1589-1670?2
- Rashid-al-Din Hamadani2
- Regiomontanus2
- Remigius of Auxerre2
- Republic of Venice2
- Richard de Saint-Laurent2
- Richard of Middleton2
- Rodrigo Sánchez de Arévalo2
- Rāmacandrabhaṭṭa2
- Sabit Alaeddin Ali2
- Sadānanda Yogīndra2
- Salamah ben Musa ben Yitsḥaḳ2
- Salih Nasr Allah ibn Sallum Halabi2
- Samuel ben Hofni2
- Sanai2
- Satyāṣāḍha2