The Virtuous Sin is a 1930 American pre-Code comedy-drama film directed by George Cukor and Louis J. Gasnier and starring Walter Huston, Kay Francis, and Kenneth MacKenna.

A separate 1931 German-language version The Night of Decision was shot at Paramount's Joinville Studios in Paris.

Marya is married to medical student Victor Sablin, who finds it impossible to deal with military life when he is inducted into the Russian army during World War I.

When her husband is sentenced to death by firing squad due to his insubordination, Marya offers herself to General Gregori Platoff in order to save him.

Mordaunt Hall of the New York Times called the film "a clever comedy with a splendid performance by Walter Huston" and added, "There is a constant fund of interest in this picture's action.