The Sin of Madelon Claudet is a 1931 American drama film directed by Edgar Selwyn and starring Helen Hayes. The screenplay by Charles MacArthur and Ben Hecht was adapted from the play The Lullaby by Edward Knoblock. It tells the story of a wrongly imprisoned woman who turns to theft and prostitution in order to support her son.

French country girl Madelon falls for artist Larry, who leaves her after she becomes pregnant. She finds help from jewel thief Carlo, but he commits suicide when the police try to arrest him. Madelon is arrested and receives a ten year term in prison for assisting him in his profession. To support her son, who does not know that she's been in prison, she becomes a street walker, allowing him to attend medical school. Written by Stephan Eichenberg