William III d’Avesnes Count of Hainault
- Born: Abt 1286, Avesnes, Artois, Pas-de-Calais, France
- Marriage: Jeanne de Valois
- Died: 7 Jun 1337, Valenciennes, Nord, Nord-Pas-de-Calais, France about age 51
 Information about this person:
• Web Reference: William Count of Hainaut.
William I, Count of Hainaut was Count William III of Avesnes, Count William III of Holland and Count William II of Zeeland from 1304 to his death. He was the son of John II, Count of Hainaut and Philippa of Luxembourg. He married Joan of Valois, sister of the future king Philip VI of France, in 1305.
William married Jeanne de Valois, daughter of Carlo comté de Valois and Margaret di Naples comtessa de Anjou. (Jeanne de Valois was born in 1294 in Valois, Bretagne, France and died on 7 Mar 1352 in Fontenelle, Yonne, Bourgogne, France.)
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