Agneta de Graeff van Polsbroek (ca. 1663/64), painted by Wallerant Vaillant
Agneta de Graeff van Polsbroek (Amsterdam, 10 November 1603 ibid 3 or 4 March 1656), was a patrician woman from the Dutch Golden Age. She became known as the mother-in-law of Johan de Witt.