Willem Hermansz. van Diest (c.1600, The Hague – c.1678, The Hague), was a Dutch Golden Age seascape painter.
He was the father of the painter Jeronymus van Diest and a follower of Jan van Goyen, Jan Porcellis and Simon de Vlieger. In 1656 he helped set up the Confrerie Pictura.
Shipwreck in a Storm (1629). The Walters Art Museum.