- Ibn ʻAllān, Muḥammad ʻAlī ibn Muḥammad, 1588-1648. Ḥusn al-ʻibārah fī naẓm al-istiʻārah1
- Ibn Ḥajar al-ʻAsqalānī, Aḥmad ibn ʻAlī, 1372-1449. Nuzhat al-naẓar fī tawḍīḥ Nukhbat al-fikar1
- Idra zuta1
- Ildephonsus, Saint, approximately 610-6671
- Illumination of books and manuscripts, French1
- Illumination of books and manuscripts, Gothic1
- Illumination of books and manuscripts--Technique1
- Impediments to marriage1
- In Coena Domini bulls1
- Incantations, Hebrew1
- Indexes1
- Indians of Central America1
- Indians of Mexico--Religion1
- Indians of the West Indies1
- Indulgences1
- Inference1
- Innocent IV, Pope, approximately 1200-12541
- Insertions (Provenance)1
- Inspiration1
- Institutiones oratoriae (Quintilian)1