- John, the Baptist, Saint1
- Joseph (Son of Jacob)1
- Judaism--Doctrines1
- Judas Iscariot1
- Judeo-Arabic literature1
- Judeo-Persian language1
- Judgment Day1
- Judgment Day (Islam)1
- Jurjānī, ʻAlī ibn Muḥammad, al-Sayyid al-Sharīf, 1340-1413. Miṣbāḥ fī sharḥ al-Miftāḥ1
- Jurjānī, ʻAlī ibn Muḥammad, al-Sayyid al-Sharīf, 1340-1413. Ḥāshiyah ʻalá Taḥrīr al-qawāʻid al-manṭiqīyah1
- Jāmiʻ al-Muẓaffarī (Damascus, Syria)1
- Jāmiʻ al-Qarawīyīn (Fès, Morocco)1
- Jārbardī, Fakhr al-Dīn Aḥmad ibn al-Ḥasan, -1345. Mughnī fī ʻilm al-naḥw1
- Kapitalbünde1
- Khabbāzī, ʻUmar ibn Muḥammad, 1231 or 1232-1292. Mughnī fī uṣūl al-fiqh1
- Khilāṭī, Muḥammad ibn ʻAbbād, -1254. Talkhīṣ al-Jāmiʻ al-kabīr1
- Kumayl ibn Ziyād, 633 or 634-7011
- Kölner Dom1
- Land grants1
- Language and languages1