Cornelis Gerritsz Decker (1618, Haarlem – 1678, Haarlem), was a Dutch Golden Age landscape painter.
According to the RKD he became a member of the Haarlem Guild of St. Luke in 1643 and painted landscapes in the manner of Jacob van Ruisdael. Some of the staffage in his landscapes was painted by Philips Wouwerman and Johannes Lingelbach.[1]