- Joseph ben Isaac Gallico1
- Josā Puṣkar1
- Jośipañcyanadikara, Śivarāma1
- Juan de la Mote1
- Judah ben Jacob1
- Jundī, Arslān ibn Muḥammad ʻAlī, active 19th century1
- Justinus of Master Stephanus1
- Jyotiṣa, Dhuḍirāja (Son of Kṛṣṇa Jyotiṣa)1
- Jñodekhāśa1
- Jābir ibn Ibrāhīm, active 16th century1
- Jābir ibn Sālim Shihāb al-Baghdādī1
- Jāgeśvara1
- Jīlānī, Ibn Muḥammad Yūsuf, active 17th century1
- Kalaṅkara Keśava1
- Kamal al-Din al-Ghazzi1
- Karmiyānī, Aḥmad ibn Muḥammad1
- Kaspar Ytelhuser1
- Kastamūnī, ʻAbd al-Raḥmān1
- Katharinenkirche, Nuremberg1
- Katherina Mast1