William II | |
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| Born | 1307 |
| Died | 26 September 1345 Warns, near Stavoren |
| Noble family | House of Avesnes |
| Spouse(s) | Joanna, Duchess of Brabant |
| Father | William I, Count of Hainaut |
| Mother | Joan of Valois |
William II (1307 – 26 September 1345) was Count of Hainaut from 1337 until his death. He was also Count of Holland (as William IV) and Count of Zeeland. He succeeded his father, Count William I of Hainaut. While away fighting in Prussia, the Frisians revolted. William returned home and was killed at the Battle of Warns.