By Series - Dictionary of World Biography: Middle Ages
- Henry I
- Henry II
- Henry II the Saint
- Henry III
- Henry IV
- Henry the Lion
- Heraclius
- Hildegard von Bingen
- Hubert de Burgh
- Ibn al-ʿArabī
- Ibn Gabirol
- Ibn Khaldūn
- Innocent III
- Innocent IV
- Jalāl al-Dīn Rūmī
- James I the Conqueror
- Jan Hus
- Jean Buridan
- Jean de Venette
- Jean Froissart
- Jean Pucelle
- Joachim of Fiore
- Jōchō
- Johannes de Muris
- John Ball
- John Duns Scotus
- John of Damascus
- John Pecham
- John Wyclif
- Judah ha-Levi
- Justinian I
- Khosrow I
- King John
- King Stephen
- Kublai Khan
- Leif Eriksson
- Leo IX
- Leonardo of Pisa
- Li Bo
- Li Qingzhao
- Louis IX
- Louis the German
- Ma Yuan
- Mahmūd Ghāzān
- Mansa Mūsā
- Marco Polo
- Margaret of Denmark, Norway, and Sweden
- Marie de France
- Mi Fei
- Michael Psellus
