- Jaʻfar Astarābādī1
- Jaʻfar Vāʻiẓ1
- Jaʻfar ibn Khaḍir Janājī1
- Jean-Claude de La Poype de Vertrieu1
- Jews1
- Joachim Heinrich Campe1
- Jonas King1
- Joshua Benzion Segre1
- Kahvecizâde, Ahmed bin Hüseyin1
- Kalb Ḥusayn ibn Faz̤l ʻAlī Tabrīzī1
- Kamāl al-Dīn Ḥusayn ibn Ḥasan Khvārazmī1
- Keçecizade İzzet Molla1
- Khalwatī, Muḥammad1
- Khaqani1
- Khujandī, Muḥammad ibn Muḥammad, -approximately 13501
- Khushal Khan Khattak1
- Khuwānsārī, Muḥammad ibn Ḥusayn, d. 17131
- Khādimī, ʻAbd Allāh ibn Muḥammad, d. 17781
- Koca Sofi1
- Kulaynī, Muḥammad ibn Yaʻqūb, -941?1