William IV of Burgundy

William IV of Burgundy, also called William III of Mâcon (c. 1088–1155), was a younger son of Count Stephen I. From 1102 he co-held Mâcon with his brother Reginald III, later adding Auxonne and Vienne.

After Reginald's death he ruled the county of Burgundy for his niece Beatrice, but kept her captive and won recognition from Frederick Barbarossa by 1152. He died on 27 September 1155, after which Frederick married Beatrice and took the county.