They Were Sisters is a 1945 British melodrama film, directed by Arthur Crabtree for Gainsborough Pictures and starring James Mason and Phyllis Calvert. The film was produced by Harold Huth, with cinematography from Jack Cox and screenplay by Roland Pertwee. They Were Sisters is noted for its frank, unsparing depiction of marital abuse at a time when the subject was rarely discussed openly. It was one of the Gainsborough Melodramas.