Guillaume d'Avesnes

Guillaume d'Avesnes (1254–1296) was a French prelate and bishop of Cambrai, a son of John I of Avesnes, Count of Hainaut. Provost of Cambrai when he was elected bishop in 1286, he quarrelled bitterly with his cathedral chapter, which was at war with his brother John II, Count of Hainaut.

In 1288 Guillaume disputed the village of Blarignies with John, and the count recovered the village. In 1291 he helped John put down the townsmen's revolt at Valenciennes. He died in 1296 while journeying to Jerusalem.