Author
- Ibn ʿAqīl1
- Ibn-al-ʿAṭṭār, ʿAlī Ibn-Ibrāhīm1
- Ibrāhīm al-Ḥusaynī1
- Ibrāhīm ibn ʻAlī Qalqashandī1
- Ibrāhīm ibn Ḥusayn1
- Iccharamasvamin1
- Ikhtiyār al-Dīn ibn Ghiyāth al-Dīn1
- Imami Heravi1
- Imbert Feutrier1
- Imām al-Dīn ibn Luṭf Allāh Lāhūrī1
- Inayat Khan1
- Inayet Efendi1
- Innocent VIII1
- Insha Allah Khan1
- Isaac Aboab of Castile1
- Isaac Israeli ben Joseph1
- Isaac Newton1
- Isidore of Seville1
- Ismail bin Mohammad Rizi1
- Ismāʻīl ibn Aḥmad Ibn al-Athīr1