That Brennan Girl, also known as Tough Girl, is a 1946 American melodrama film produced and directed by Alfred Santell and starring James Dunn, Mona Freeman, William Marshall, and June Duprez. The story concerns a young woman raised in an unwholesome environment who joins a confidence racket run by one of her mother's friends. She agrees to marry the victim of one of her scams, becomes a war widow, and is left to raise a baby, but abandons it each evening to go out dancing. After the child suffers an accident in her absence, she is charged with child neglect and loses custody. She mends her ways by devotedly caring for an abandoned infant and meets up again with the con man, who has also reformed after a prison stint, and together they build a new life. The film was the last work of director Santell and the last leading role for actor Dunn.

James Howard Dunn, billed as Jimmy Dunn in his early career, was an American stage, film, and television actor, and vaudeville performer. The son of a New York stockbroker, he initially worked in his father's firm but was more interested in theater. He landed jobs as an extra in short films produced by Paramount Pictures in its Long Island studio, and also performed with several stock theater companies, culminating with playing the male lead in the 1929 Broadway musical Sweet Adeline. This performance attracted the attention of film studio executives, and in 1931, Fox Film signed him to a Hollywood contract.