Willem van Diest

'''Willem Hermansz. van Diest''' (c. 1600 in The Hague – c. 1678 in 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.