Author
- Ibrāhīm ibn Muṣṭafá Waḥdī1
- Ibrāhīm ibn Yūsuf Būlawī1
- Ibrāhīm ibn Ḥusayn1
- Inayat Khan1
- Isaac Luria1
- Isaac Newton1
- Isaac of Troki1
- Ismail ibn Hammad al-Jawhari1
- Ismāʻīl Ghāzānī1
- Ismāʻīl Mufīd1
- Israel Alnaqua1
- Israel Yaakov Algazi1
- Isḥāq ibn Ibrāhīm Fārābī1
- Izz al-Din ibn Hibatullah ibn Abi l-Hadid1
- Jacob Israel Karmi1
- Jacob Meyer1
- Jacob ben Reuben ibn Zur1
- Jaghmini1
- Jai Singh II1
- Jalal al-Din Mohammad Tabrizi1