- Hospitals, Medieval3
- Ibn Bābawayh al-Qummī, Muḥammad ibn ʻAlī, 918 or 919-991 or 992. Man lā yaḥḍuruhu al-faqīh3
- Ibn Ḥajar al-ʻAsqalānī, Aḥmad ibn ʻAlī, 1372-1449. Nuzʹhat al-naẓar fī tawḍīḥ Nukhbat al-fikar3
- Ijtihād (Islamic law)3
- India--Hyderabad3
- India--Jammu and Kashmir3
- Inference3
- Iran--Ardabīl3
- Iran--Qazvīn3
- Iraq--Karbalāʼ3
- Iraq--Sandūr3
- Isfarāyīnī, Muḥammad ibn Muḥammad, d. 1285. Lubb al-albāb fī ʻilm al-iʻrāb3
- Ishārāt wa-al-tanbīhāt (Avicenna)3
- Istiṣḥāb (Islamic law)3
- Italy--Ferrara3
- Italy--Naples3
- Italy--Reggio Emilia3
- Iʻrāb ʻan qawāʻid al-iʻrāb (Ibn Hishām, ʻAbd Allāh ibn Yūsuf)3
- Jamʻ al-jawāmiʻ fī al-uṣūl (Subkī, Tāj al-Dīn ʻAbd al-Wahhāb ibn ʻAlī)3
- Jerome, Saint, -419 or 4203