The Lone Wolf Keeps a Date is a 1940 American mystery crime film directed by Sidney Salkow and starring Warren William, Frances Robinson, Bruce Bennett and Eric Blore. It is the sixth Lone Wolf film produced by Columbia Pictures. It features William in his fourth appearance as the title character and Edward Gargan, Lester Matthews and Don Beddoe as the film's antagonists. The screenplay was written by Salkow and Earl Felton.

Warren William was a Broadway and Hollywood actor, immensely popular during the early 1930s; he was later nicknamed the "King of Pre-Code". He was the first actor to play Perry Mason.