- Hindu philosophy1
- Hinduism1
- Horoscopes1
- Ibn Ghāzī, Muḥammad ibn Aḥmad, 1437 or 1438-1513. Munyat al-ḥussāb1
- Ibn al-Hāʼim, Aḥmad ibn Muḥammad, -1412. Ghāyat al-suʼūl1
- Ibn al-Hāʼim, Aḥmad ibn Muḥammad, -1412. Lumaʻ al-yasīrah fī ʻilm al-ḥisāb1
- Ibn al-Majdī, Aḥmad ibn Rajab, 1366-1447. Irshād al-ḥāʼir1
- Ibn al-Sarrāj, Aḥmad ibn Abī Bakr, active 14th century1
- Ibn al-ʻArabī, 1165-1240. Manẓūmat Kashf al-Rān1
- Illustrated works1
- Iran1
- Isfarāyīnī, Muḥammad ibn Muḥammad, -1285. Ḍawʼ al-Miṣbāḥ1
- Islam--Doctrines1
- Islam--Prayers and devotions1
- Islamic astronomy1
- Islamic ethics1
- Islamic law1
- Islamic occultism1
- Jainism1
- Jewish astronomy1