Frans Denys (c. 1610, Antwerp – 1670, Mantua), was a Flemish Baroque painter.
He became a master in the Antwerp Guild of St. Luke in 1631 and got married the next year to Martina Vleckhamer, who died in 1647, so he was married for the second time when his son Jacob was born. He became court painter to Ranuccio II Farnese, Duke of Parma and also painted for Archduchess Isabella Clara of Austria. He was the teacher of the painters Jan de Duyts and Ignatius Janssen. He moved to Mantua where he later died.