Author
- Ibn Sab'in1
- Ibrāhīm al-ʻĀmilī1
- Igreja e Convento de Santa Maria de Aguiar1
- Innocent III1
- Innocent IV1
- Ippolito Libri1
- Isaac ben Joseph of Corbeil1
- Isaiah di Trani1
- Isidore of Seville1
- Iskandar Rūmī1
- Ismail ibn Hammad al-Jawhari1
- Jabir ibn Hayyan1
- Jacob of Serugh1
- Jacobus de Voragine1
- Jaimini1
- Jalal al-Din Davani1
- Jalal al-Din al-Qazwini1
- Jalāl al-Dīn al-Thīrī1
- James of Milan1
- Jayāditya1