Author
- Ibn Luyun1
- Iccharamasvamin1
- Isaac Israeli ben Joseph1
- Jacopo Ragone1
- Jagannatha Panditaraja1
- Jagannāth, Svāmī1
- Jagannātha Dīkṣita (Son of Yādava Dīkṣita)1
- Jayalakṣmī1
- Jayarāmanyāyapañcānana1
- Jean Gerson1
- Jerome1
- Johannes Mellarinus1
- Johannes de Sacrobosco1
- Johannes von Kastl1
- Jordan von Quedlinburg1
- Jñānamṛtapata1
- Kalyanamalla1
- Kamalakara1
- Kanada1
- Kavikānta Sarasvatī1