- Islamic calendar1
- Islamic cosmology1
- Islamic eschatology1
- Islamic heresies1
- Islamic sects1
- Israel--Acre1
- Iṣfahānī, Maḥmūd ibn ʻAbd al-Raḥmān, 1275 or 1276-1348 or 1349. Maṭāliʻ al-anẓār1
- Jawī Zādah, Muḥammad ibn Ilyās, -1547 or 1548. Risālah fī al-masḥ ʻalá al-khuffayn1
- Jumʻah1
- Jāmī, 1414-14921
- Jīlī, ʻAbd al-Karīm ibn Ibrāhīm, 1365 or 1366- Insān al-kāmil fī maʻrifat al-awākhir wa-al-awāʼil1
- Kemalpaşazade, 1468 or 1469-1534. Tafsīr al-Fātiḥah1
- Kemalpaşazade, 1468 or 1469-1534. Īḍāḥ al-iṣlāḥ1
- Khiḍr (Legendary character)1
- Khwājahʹzādah, Muṣṭafá ibn Yūsuf, -1487 or 14881
- Kinship (Islamic law)1
- Knowledge, Theory of (Islam)1
- Kāfiyah (Ibn al-Ḥājib, ʻUthmān ibn ʻUmar)1
- Leather doublures1
- Legacies (Islamic law)1