Olaf Rude (26 April 1886 – 17 June 1957) was a Danish painter.
He is remembered in particular for his paintings of oak trees at Skejten on Lolland, two of which can be seen at Christiansborg.
As a child, he moved with his family to Frejlev (Guldborgsund Municipality) on the island of Lolland.
In 1905, he studied at the Copenhagen Technical School and later at the Kunstnernes Frie Studieskole where he was taught by Kristian Zahrtmann and Johan Rohde.
On returning to Denmark, he became one of the classic modernists who around the time of the First World War focused on formal representation concentrating on form, line and colour.