William II of Dampierre
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William II (1196 – 3 September 1231) was the lord of Dampierre from 1216 until his death. He was the son of Guy II, constable of Champagne, and Matilda, heiress of Bourbon.
His brother, Archambaud VIII, inherited Bourbon and he Dampierre. He married Margaret II, Countess of Flanders and Hainault, in 1223 and was thus regent of Flanders until his death as "Willem (or Guillaume) I."
He had four children (three sons) by Margaret and the eldest took part in the War of the Succession of Flanders and Hainault:
- William III, Count of Flanders and Lord of Courtrai
- Guy, Count of Flanders and Margrave of Namur
- John I, Lord of Dampierre, Viscount of Troyes, and Constable of Champagne
- Joanna, married in 1239 to Hugh III of Rethel, then in 1243 to Thiebaut II of Bar
