- Ibn Nawbakht, Ibrāhīm, 10th cent. Yāqūt1
- Ibn Zaydūn, Aḥmad ibn ʻAbd Allāh, 1003 or 4-1071. Risālah al-hazalīyah1
- Ibn al-Fāriḍ, ʻUmar ibn ʻAlī, 1181 or 1182-1235. Tāʾīyah1
- Ibn al-Sāʻātī, Aḥmad ibn ʻAlī, 1254-1294 or 5. Majmaʻ al-baḥrayn wa-multaqá al-nayyirayn1
- Ibn al-ʻImād al-Aqfahsī, Aḥmad, approximately 1349-1405. Ādāb mā yatakarraru fī al-yawm wa-al-laylah1
- Ikmāl (Ibn Mākūlā, ʻAlī ibn Hibat Allāh)1
- Illumination of books and manuscripts, English1
- Imamate1
- Imams (Shiites)1
- Imām al-Ḥaramayn al-Juwaynī, ʻAbd al-Malik ibn ʻAbd Allāh, 1028-1085. Irshād ilá qawāṭiʻ al-adillah fī uṣūl al-iʻtiqād1
- Indulgences1
- Interfaith relations1
- Iran--Ardabīl1
- Iran--Iṣfahān1
- Iran--Sabzevār (Khurāsān-i Raz̤avī)1
- Iran--Shīrāz1
- Iraq--Erbil1
- Iraq--Kāẓimīyah1
- Iraq--Najaf1
- Islamic bindings1