William of Chalon-Auxerre

William of Chalon, called the Great (c. 1270–1304), was count of Auxerre and Tonnerre and lord of Rochefort. The only son of John I of Chalon and the heiress Alix of Burgundy, he succeeded his mother in Auxerre, and in 1292 his aunt Margaret of Burgundy granted him part of her rights over Tonnerre.

In 1302 he attended Philip IV's first Estates General and married Eleanor, daughter of Count Amadeus V of Savoy. He fought in Philip IV's Flemish war and fell at the battle of Mons-en-Pévèle on 18 July 1304, leaving a minor son, John II.