- Historia de regibus Gothorum, Vandalorum, et Suevorum (Isidore, of Seville, Saint)1
- Humanism1
- Humanistic ethics1
- Ibn al-Nafīs, ʻAlī ibn Abī al-Ḥazm, 1210 or 1211-1288. Mūjaz al-Qānūn fī al-ṭibb1
- Ibn al-Nafīs, ʻAlī ibn Abī al-Ḥazm, 1210 or 1211-1288. Mūjaz fī al-ṭibb1
- Illumination of books and manuscripts1
- Illumination of books and manuscripts, Gothic1
- Incunabula1
- Indexes1
- Islam and philosophy1
- Islamic Empire1
- Islamic law--Interpretation and construction1
- Italian rotunda (script)1
- Italy--Ferrara1
- Italy--Venice1
- Italy--Vicenza1
- Iṣfahānī, Maḥmūd ibn ʻAbd al-Raḥmān, 1275 or 1276-1348 or 1349. Tashyīd al-Qawāʻid1
- Jerome, Saint, -419 or 4201
- Jāmiʻ al-ṣaḥīḥ (Bukhārī, Muḥammad ibn Ismāʻīl)1
- Jāmiʻ al-ṣaḥīḥ (Muslim ibn al-Ḥajjāj al-Qushayrī)1