- Jurjānī, ʻAlī ibn Muḥammad, al-Sayyid al-Sharīf, 1340-1413. Ḥāshiyah ʻalá Taḥrīr al-qawāʻid al-manṭiqīyah1
- Justa, Saint, -approximately 2871
- Justice, Administration of1
- János I Zápolya, King of Hungary, 1487-15401
- Jābir ibn Ḥayyān1
- Jāmiʻ al-Azhar1
- Jāmiʻ al-ṣaḥīḥ (Muslim ibn al-Ḥajjāj al-Qushayrī)1
- Jāmī, 1414-1492. Rubāʻīyāt1
- Kansas--Lawrence1
- Kanz al-daqāʼiq (Nasafī, ʻAbd Allāh ibn Aḥmad)1
- Karshuni1
- Khawāfī, Muḥammad ibn Muḥammad, 1356-1435. Awrād al-Zaynīyah1
- Khānaqāh-i Niʻmat Allāhī1
- Kings and rulers--Duties1
- Kings and rulers--Heraldry1
- Kirchmair, Georg, 1481-15541
- Knotesford, John, -15891
- Kārtavīryārjuna (Hindu deity)1
- Lamoignon de Basville, M. de (Nicolas), 1648-17241
- Land value taxation1