Galka Scheyer (born Emilie Esther Scheyer; 15 April 1889, Braunschweig – 13 December 1945, Los Angeles) was a German-American painter, art dealer, art collector, and teacher. She was the founder of the "Blue Four," an artists' group that consisted of Lyonel Feininger, Wassily Kandinsky, Paul Klee and Alexej von Jawlensky.