- Ibn al-Hāʼim, Aḥmad ibn Muḥammad, -1412. Lumaʻ al-yasīrah fī ʻilm al-ḥisāb1
- Ibn al-ʻArabī, 1165-1240. Janāḥ al-ṭāʼir1
- Indian philosophy1
- Inventions1
- Iran1
- Isfarāyīnī, Muḥammad ibn Muḥammad, -1285. Ḍawʼ al-Miṣbāḥ1
- Islam--Rituals1
- Islamic astrology1
- Islamic astronomy1
- Islamic ethics1
- Islamic occultism1
- Jewish magic1
- Jīlī, ʻAbd al-Karīm ibn Ibrāhīm, 1365 or 1366- Insān al-kāmil fī maʻrifat al-awākhir wa-al-awāʼil1
- Kaydānī. Maṭālib al-muṣallī1
- Keśavācārya Daivajña, active 16th century. Jātakapaddhati1
- Khiḍr (Legendary character)1
- Khūjahʹzādah, ʻAbd al-Naṣīr ibn ʻAbd Allāh, active 16th century. Taḥrīrāt ʻalá al-Ṭarīqah al-Muḥammadīyah1
- Knowledge, Theory of (Islam)1
- Manuscripts, Armenian1
- Manuscripts, Braj1