Salka Viertel (15 June 1889 – 20 October 1978) was an Austrian actress and screenwriter.
Viertel was born Salomea Sara Steuermann in Sambor, a city then in the province of Galicia, which was a part of the Austro-Hungarian Empire, but today is in western Ukraine.
Viertel was under contract with Metro-Goldwyn-Mayer from 1933 to 1937, and co-wrote the scripts for many movies, particularly those starring her close friend Greta Garbo, including Queen Christina (1933) and Anna Karenina (1935).
She also played opposite Garbo in MGM's German-language version of Anna Christie in 1930.