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.

In 2018 a re-mastered and restored print by Paramount Pictures, The Film Foundation, and Martin Scorsese was screened at the Museum of Modern Art as part of the museum's program of showcasing 30 restored films from the library of Republic Pictures, curated by Scorsese.