Katrin Sass (Schwerin, October 23, 1956) is a German actress, a prominent figure in the cinema of both the German Democratic Republic (GDR) and reunified Germany.

Her film career began with significant roles in DEFA films, such as *Bis zum bitteren Ende* (1975) and *Bürgschaft für ein Jahr* (1981), which earned her early acclaim. She achieved international fame with her role as Christiane Kerner in *Good Bye, Lenin!* (2003), a performance that solidified her global reputation.

Sass is known for her ability to portray strong, resilient, and deeply human women, often set in everyday contexts. Her acting style is characterized by raw authenticity and intense expressiveness, making her one of the most respected actresses in German cinema. She has continued to work successfully in films and television series such as *Weissensee*.