Willem, Baron Ripperda, Lord of Hengelo, Boekelo, Boxbergen, Rijsenburg and Solmsburg (Twente, 1600 - Hengelo, 1669), was an ambassador at the peace conferences of Osnabrück and Münster which ended both the Thirty Years' War in Germany and the Eighty Years' War between Spain and the Netherlands.
Willem was the son of Baron Unico Ripperda van Boxbergen, drost of Twente, and Anna van Doetinchem. The old, noble House of Ripperda originally came from Groningen. In 1627 he married Aleyd van den Bouchorst tot Wimmenum.
Willem Ripperda left his military career in 1623. In 1631 he was elected to represent the Province of Overijssel at the States-General of the Netherlands in The Hague. He was a loyal supporter of the Prince of Orange and was sent to the peace negotiations in Osnabrück and Münster in 1644. These resulted in the signing of the Peace of Westphalia.