William III, Count of Hainaut (1286 - 7 June 1337) was Count William III of Avesnes, Count William III of Holland and Count William II of Zeeland from 1304 to his death.
He is son of John II, Count of Hainaut and Philippa of Luxembourg
He married Jeanne de Valois (Joan of Valois) before 1311. They had eight children:
- William II, Count of Hainaut (1307-1345)
- John (died 1316)
- Margaret II, Countess of Hainaut (1311-1356), married Louis IV, Holy Roman Emperor
- Philippa of Hainault (1311-1369), married King Edward III of England
- Agnes (died 1327)
- Joanna of Hainaut (1315-1374), married William V, Duke of Jülich
- Isabelle of Hainaut (1323-1361), married Robert of Namur
- Louis (1325-1328)
He had seven other children with Trude Boudijnsdotter van de Poule and other mistresses.
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No known carriers of Guillaume's Y-chromosome or his mother's mitochondrial DNA have taken yDNA or mtDNA tests.
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