Author
- Ibrāhīm ibn ʻAlī Qalqashandī1
- Iccharamasvamin1
- Ilyās ibn ʻAbbās Mullā Shaykh al-Kurdī1
- Imbert Feutrier1
- Imām al-Dīn ibn Luṭf Allāh Lāhūrī1
- Inayet Efendi1
- Innocent III1
- Innocent VIII1
- Innocent XI1
- Insha Allah Khan1
- Isaac Aboab of Castile1
- Isaac Israeli ben Joseph1
- Isaac Lopez1
- Isaac of Troki1
- Isaak ben Meïr from Düren1
- Isidore of Seville1
- Ismāʻīl Jarrāḥī1
- Ismāʻīl Qarah Kamāl1
- Ismāʻīl ibn Aḥmad Ibn al-Athīr1
- Ismāʻīl ibn Muḥammad Māzandarānī1