For Them That Trespass is a 1949 British crime film directed by Alberto Cavalcanti and starring Richard Todd, Patricia Plunkett and Stephen Murray.

Promising writer Christopher Drew conceals his relationship with a murdered woman in order to protect his career, even though this results in an innocent man going to prison for the killing.

The upper-class Drew decides he needs some first-hand experience to invigorate his work, so he explores the seedier areas of town in search of inspiration.

Much to his dismay, he witnesses a murder, but he then refuses to help an innocent man, Herbert Logan, who has been arrested for the crime, because his presence in such a neighbourhood would cause a scandal.

He hears his "crime" detailed in a radio drama written by Drew and gathers enough evidence to clear his name.