Jacob van der Roer van Dordrecht (1613, Dordrecht - 1691, Dordrecht), was a Dutch Golden Age portrait painter.
According to Houbraken, who mentioned him in passing with a list of painters from Dordrecht, he first learned from Cornelis Bisschop, and later became a pupil of Jan de Baen, who taught him portrait painting.[1]
He travelled to London and couldn't compete with Godfrey Kneller as a portrait painter, but Kneller hired him to paint clothing and less important parts of Kneller's paintings.[2] Roer van Dordrecht returned to Dordrecht and later died in the Gasthuis there.[2]
According to the RKD he was a pupil of Godfrey Kneller and is only known as a draughtsman of decorations on title pages.[3]