- Jawī Zādah, Muḥammad ibn Ilyās, -1547 or 1548. Risālah fī al-masḥ ʻalá al-khuffayn1
- Jidd Ḥafṣī, ʻAlī ibn Luṭf Allāh, active 17th century-18th century1
- Judges (Islamic law)1
- Judicial power (Islamic law)1
- Jumʻah1
- Jurjānī, ʻAlī ibn Muḥammad, al-Sayyid al-Sharīf, 1340-1413. Sharḥ Farāʼiḍ al-Sirājīyah1
- Jurjānī, ʻAlī ibn Muḥammad, al-Sayyid al-Sharīf, 1340-1413. Ḥāshiyah ʻalá Sharḥ Ḥikmat al-ʻayn1
- Jurjānī, ʻAlī ibn Muḥammad, al-Sayyid al-Sharīf, 1340-1413. Ḥāshiyah ʻalá Taḥrīr al-qawāʻid al-manṭiqīyah1
- Justice--Religious aspects--Islam1
- Jāmiʻ al-Qarawīyīn (Fès, Morocco)1
- Jāmiʻ al-ṣaghīr (Suyūṭī)1
- Jārūdī, Nāṣir ibn Muḥammad, active 18th century1
- Kanz al-daqāʼiq (Nasafī, ʻAbd Allāh ibn Aḥmad)1
- Kemalpaşazade, 1468 or 1469-1534. Iṣlāḥ wa-al-īḍāḥ1
- Kemalpaşazade, 1468 or 1469-1534. Īḍāḥ al-iṣlāḥ1
- Khabbāzī, ʻUmar ibn Muḥammad, 1231 or 1232-1292. Mughnī fī uṣūl al-fiqh1
- Khalīl ibn Isḥāq al-Jundī, -1365? Mukhtaṣar. Bāb al-yamīn1
- Khādimī, Muḥammad ibn Muṣṭafá, 1701 or 2-1762 or 3. Majāmiʻ al-ḥaqāʼiq wa-al-qawāʻid wa-jawāmiʻ al-raqāʼiq wa-al-fawāʼid1
- Kāfiyah (Ibn al-Ḥājib, ʻUthmān ibn ʻUmar)1
- Kūrānī, Ṭānā ibn Aḥmad, d. 1884? Naẓm Mukhtaṣar al-Manār1