Coloman I the Book-lover, also spelled Koloman (c. 1074 – 3 February 1116), King of Hungary (1095–1116) and Croatia (from 1108 full royal title "King of Hungary, Slavonia, Croatia and Dalmatia").

Although Coloman is their father's elder son, during his reign Coloman has to fight against his brother, Duke Álmos, who always disputes his right to the crown because Coloman probably has a physical deformity.

Finally, Coloman ordes that his brother and his infant son be blinded, which causes later chroniclers, who live in the court of his brother's descendants, to accuse him of viciousness.

However, he is one of the most educated rulers of his age.

The Polish chronicler Gallus Anonymus describes him as the king "who was more educated in literary sciences than any of the kings who was living in his age".

Coloman, as legislator, mitigates the austerity of his predecessor's decrees.