Ruth Stephan (27 October 1925 – 8 August 1975) was a German film and stage actress.^[1] She appeared with Heinz Erhardt in the 'Willi' series of films.

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Ruth Stephan was born to retail merchant Kurt Stephan and his wife, Kriemhilde. After graduating from school, she first worked as a certified bank teller before taking acting lessons.

During her early acting career, she worked mostly on the stage in Germany, including theaters in Hamburg and Berlin. She appeared in her first movie in 1951, and subsequently became a popular figure in German comedy movies.

Most notably she appeared in numerous movies alongside Heinz Erhardt, often playing his wife or secretary. She also became popular for portraying an English and biology teacher in the late 1960s high school movie series Die Lümmel von der ersten Bank (English translation: The buggers from the first bench).

In the early 1970s Stephan went back to the stage. She died of lung cancer in August 1975. A street in the district of Berlin-Spandau is named after her.