- Rawḍat al-nāẓir wa-jannat al-munāẓir (Ibn Qudāmah, Muwaffaq al-Dīn ʻAbd Allāh ibn Aḥmad)1
- Reasoning1
- Registers (Lists)1
- Relations1
- Religion1
- Religious calendars1
- Religious ethics1
- Religious minorities--Legal status, laws, etc.1
- Remboîtage1
- Riddles1
- Riddles, Persian1
- Risālah (Ibn Abī Zayd al-Qayrawānī, ʻAbd Allāh ibn ʻAbd al-Raḥmān)1
- Rituals1
- Rodents--Religious aspects--Islam1
- Romances1
- Romania1
- Ruhāwī, Ḥusām al-Dīn, 14th cent. ʻUqūd al-jawāhir wa-durar al-mafākhir1
- Russia (Federation)--Tarki1
- Rāfiʻī, ʻAbd al-Karīm ibn Muḥammad, 1162-1226. Muḥarrar1
- Rāzī, Fakhr al-Dīn Muḥammad ibn ʻUmar, 1149 or 1150-1210. Lubāb al-Ishārāt1