- Ireland3
- Iron mines and mining1
- Irshād al-adhhān ilá aḥkām al-īmān (Ibn al-Muṭahhar al-Ḥillī, al-Ḥasan ibn Yūsuf)6
- Isaac (Biblical patriarch)1
- Isabel, of Coimbra, Queen, consort of Afonso V, King of Portugal, 1432-14551
- Isabella I, Queen of Spain, 1451-15046
- Isagoge (Porphyry)4
- Isaiah (Biblical prophet)2
- Isbījābī, Aḥmad ibn Manṣūr, -approximately 1087. Sharḥ al-Mukhtaṣar fī al-fiqh1
- Ise monogatari1
- Isfarāyīnī, Muḥammad ibn Muḥammad, -1285. al-Lubāb fī ʻilm al-iʻrāb1
- Isfarāyīnī, Muḥammad ibn Muḥammad, -1285. Ḍawʼ al-Miṣbāḥ5
- Isfarāyīnī, Muḥammad ibn Muḥammad, d. 1285. Lubb al-albāb fī ʻilm al-iʻrāb3
- Isfarāyīnī, Muḥammad ibn Muḥammad, d. 1285. Lubāb al-iʻrāb2
- Isfarāyīnī, Muḥammad ibn Muḥammad, d. 1285. Ḍawʼ ʻalá al-Miṣbāḥ4
- Ishrāqīyah3
- Ishārāt wa-al-tanbīhāt (Avicenna)12
- Isidore, of Seville, Saint, -6362
- Iskandarnāmah (Niẓāmī Ganjavī)2
- Islam450