Willem Gillisz Kool (1608 – 1666), was a Dutch Golden Age painter.
He was born in Haarlem and entered the Haarlem Guild of St. Luke in 1638.
[1] In the same year he married Cornelia van der Molen, daughter of Jan Gerritsen van der Molen, on 17 januari 1638.
He is known for landscapes and died in Haarlem.
[1] This article about a Dutch painter is a stub.