Author
- Ibn al-Tayyib1
- Ibn ʻAbd al-Riḍá1
- Ibn-al-Anbārī1
- Ibrāhīm ibn Muḥammad ʻIṣām al-Asfarāyīnī1
- Ibrāhīm ibn ʻAlī Ḥuṣrī1
- Imad ad-Din al-Isfahani1
- Imam Birgivi1
- Inayat Khan1
- Izz al-Din ibn 'Abd al-Salam1
- Jacobus de Cessolis1
- Jacopone da Todi1
- Jaghmini1
- Jahangir Mirza Qajar1
- Jakob Christoph Blarer von Wartensee1
- Jami1
- Jean de Wavrin1
- Jerome1
- Jerónimo Román y Zamora1
- Joannes de Crivelli1
- Johannes Tostius1