- Religious calendars--Islam1
- Religious minorities--Legal status, laws, etc.1
- Rent (Islamic law)1
- Revelation--Islam1
- Rhetoric1
- Riddles1
- Riddles, Arabic1
- Riddles, Persian1
- Riddles, Turkish1
- Risālah al-Ḥusaynīyah1
- Risālah fī al-tawḥīd (Jaʻbarī, Arslān ibn Yaʻqūb)1
- Rodents--Religious aspects--Islam1
- Romances1
- Rome (Empire)1
- Rāzī, Fakhr al-Dīn Muḥammad ibn ʻUmar, 1149 or 1150-1210. Lubāb al-Ishārāt1
- Rīzawī, ʻUthmān Ṣabrī ibn Ismāʻīl, active 19th century. Risālah al-jadīdah fī al-waḍʻ1
- Sabzavārī, Hādī ibn Mahdī, b. 1797 or 8. Tālīqāt ʻalá Asrār al-āyāt1
- Sajāwandī, Sirāj al-Dīn Muḥammad ibn Muḥammad, active 12th century. Waqf wa-al-ibtidāʼ1
- Sales (Islamic law)1
- Samaritans1