- Judgment Day (Islam)1
- Judgment of God1
- Julian, of Eclanum, Bishop, 380-approximately 4551
- Julii family1
- 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. Sharḥ mushkilāt al-Kashshāf1
- Jurjānī, ʻAlī ibn Muḥammad, al-Sayyid al-Sharīf, 1340-1413. Ḥāshiyah ʻalá al-Sharḥ al-Muṭawwal1
- Jurjānī, ʻAlī ibn Muḥammad, al-Sayyid al-Sharīf, 1340-1413. Ḥāshiyah ʻalá sharḥ Tajrīd al-iʻtiqād1
- Jāmiʻ al-Qarawīyīn (Fès, Morocco)1
- Jāmiʻ al-ṣaḥīḥ (Muslim ibn al-Ḥajjāj al-Qushayrī)1
- Kanz al-daqāʼiq (Nasafī, ʻAbd Allāh ibn Aḥmad)1
- Khabbāzī, ʻUmar ibn Muḥammad, 1231 or 1232-1292. Mughnī fī uṣūl al-fiqh1
- Khabbāzī, ʻUmar ibn Muḥammad, 1231 or 2-1292. Mughnī fī uṣūl al-fiqh1
- Khujandī, ʻAlī, d. ca. 1427. Quṣārá fī al-taṣrīf1
- Kitāb fī al-fiqh al-Shāfiʻī1
- Kloster Medingen1
- Knowledge, Theory of1
- Kumayl ibn Ziyād, 633 or 634-7011
- Kölner Dom1
- Labyrinths1