John de Critz or John Decritz (1551/2 – 14 March 1642 (buried)) was one of a number of painters of Flemish origin active at the English royal court during the reigns of James I of England and Charles I of England. He held the post of Serjeant Painter to the king from 1603, at first jointly with Leonard Fryer and from 1610 jointly with Robert Peake the Elder.