- Justinian I, Emperor of the East, 483?-5652
- János I Zápolya, King of Hungary, 1487-15401
- Jābir ibn Ḥayyān1
- Jāmiʻ al-Azhar4
- Jāmiʻ al-Qarawīyīn (Fès, Morocco)1
- Jāmiʻ al-ṣaghīr (Suyūṭī)8
- Jāmiʻ al-ṣaḥīḥ (Bukhārī, Muḥammad ibn Ismāʻīl)26
- Jāmiʻ al-ṣaḥīḥ (Muslim ibn al-Ḥajjāj al-Qushayrī)14
- Jāmī, 1414-1492. Risālah-i muʻammā1
- Jāmī, 1414-1492. Tafsīr al-fātiḥah al-sharīfah1
- Jānakīnātha Bhaṭṭācārya, active 16th century. Nyāyasiddhāntamañjarī2
- Jārbardī, Fakhr al-Dīn Aḥmad ibn al-Ḥasan, -1345. Mughnī fī al-naḥw1
- Jārbardī, Fakhr al-Dīn Aḥmad ibn al-Ḥasan, -1345. Mughnī fī ʻilm al-naḥw1
- Jārbardī, Fakhr al-Dīn Aḥmad ibn al-ḥasan, d. 1345. Mughnī fī ʻilm al-naḥw1
- Jārūdī, Nāṣir ibn Muḥammad, active 18th century1
- Jīlī, ʻAbd al-Karīm ibn Ibrāhīm, 1365 or 1366- Insān al-kāmil fī maʻrifat al-awākhir wa-al-awāʼil1
- Jīlī, ʻAbd al-Karīm ibn Ibrāhīm, 1365 or 1366- Risālat al-Tawḥīd1
- Kabāʼir (Muḥammad ibn ʻAbd al-Wahhāb)1
- Kaffawī, Muḥammad ibn Ḥumayd, -1760 or 1761. Ādāb al-baḥth1
- Kalbī, Diḥyah ibn Khalīfah, -approximately 6701