Margarete "Grete" Diercks (September 1, 1890, in Hamburg – July 15, 1978, in Lauingen) was a German actress.
Diercks had been active since childhood as an actress at the 1900 Deutsches Schauspielhaus in Hamburg.
Although she had never attended a formal acting school, she remained dedicated to the theater as a young woman.
The cinema gained importance in Diercks' artistic career only towards the end of World War I, and she was cast in a series of minor, supporting, and leading roles in a number of German productions, including Ernst Lubitsch's Carmen and Rausch and F. W. Murnau's Der brennende Acker and E. A. Dupont's first adaptation of the popular high-alpine drama Die Geierwally.
She meanwhile continued to act in live theater performances, appearing in 1918 at the comedy house in Melchior Lengyel and Lajos Bíró's play Die Zarin and 1921 at the Berlin Lustspielhaus in Angelo Cana's Der Werwolf.