- Ismāʻīl II, Shah of Iran, 1533 or 1534-15771
- Istiṣḥāb (Islamic law)1
- Iṣfahānī, Maḥmūd ibn ʻAbd al-Raḥmān, 1275 or 1276-1348 or 1349. Maṭāliʻ al-anẓār1
- Jawshan al-kabīr1
- Jighmīnī, Maḥmūd ibn Muḥammad, -1221? Qānūnchah1
- Jighmīnī, Maḥmūd ibn Muḥammad, -1221?. Qānūnchah1
- Jumʻah1
- Jurjānī, ʻAlī ibn Muḥammad, al-Sayyid al-Sharīf, 1340-1413. Ḥāshiyah ʻalá Sharḥ Mukhtaṣar al-Muntahá1
- Jābir ibn Ḥayyān1
- Jāmiʻ al-ṣaghīr (Suyūṭī)1
- Jāmī, 1414-14921
- Jāmī, 1414-1492. Poems1
- Jāmī, 1414-1492. Risālah-i muʻammā1
- Jārbardī, Fakhr al-Dīn Aḥmad ibn al-Ḥasan, -1345. Mughnī fī ʻilm al-naḥw1
- Khānaqāh-i Niʻmat Allāhī1
- Kurds1
- Kāsānī, Aḥmad Khvājagī1
- Landscapes1
- Language and languages--Philosophy1
- Legacies (Islamic law)1