Burchard IV or Bouchard IV (1182–1244) was the lord of Avesnes and Étrœungt. He was the son of James of Avesnes and Adela of Guise and brother of Walter, Count of Blois. Bouchard began his career as a cantor and subdeacon in the church of Laon. In 1212, he was named bailiff of Hainaut. In this capacity, he served as tutor and guardian of the young Margaret, sister of Joanna, Countess of Flanders and Hainault. He later married Margaret in 1212, though she was only ten years old and the marriage could not be consummated. Neither Joanna nor Count Ferdinand gave their consent, and tried to have the marriage stopped, they failed.