Rudolf Rittner (June 30, 1869 – February 4, 1943) was a German actor born in Weissbach, Moravia, famous for playing knight and folk hero Florian Geyer in Gerhart Hauptmann's drama of the same name. The well-known German painter Lovis Corinth portrayed him in 1906. Only one year later, at the age of 38, Rittner being at the peak of his career retired as theatrical actor.