- Hagiography in literature3
- Hebrew poetry3
- Hoccleve, Thomas, 1370?-1450?3
- Hybrid books3
- Hymns, Latin (Medieval and modern)3
- Illumination of books and manuscripts, Flemish3
- Indulgences3
- Initials3
- Ink3
- Isfarāyīnī, Muḥammad ibn Muḥammad, d. 1285. Lubb al-albāb fī ʻilm al-iʻrāb3
- Islamic calendar3
- Islamic occultism3
- Italy--Naples3
- Italy--Orvieto3
- Italy--Torri in Val di Pesa3
- Iṣfahānī, Maḥmūd ibn ʻAbd al-Raḥmān, 1275 or 1276-1348 or 1349. Maṭāliʻ al-anẓār3
- Jamʻ al-jawāmiʻ fī al-uṣūl (Subkī, Tāj al-Dīn ʻAbd al-Wahhāb ibn ʻAlī)3
- Jaʻbarī, Ibrāhīm ibn ʻUmar, 1242 or 1243-1331 or 1332. Wāḍiḥah fī tajwīd al-Fātiḥah3
- Jewish calendar3
- Jewish magic3