Old Mother Riley Detective is a 1943 British comedy film directed by Lance Comfort and starring Arthur Lucan, Kitty McShane and Hal Gordon.

Old Mother Riley investigates the disappearance of food during the war, a serious crime because of rationing.

As the office charwoman, Old Mother Riley's fingerprints are all over the safe, and she becomes the police's number one suspect.

To prove her innocence, Mother Riley turns detective, adopting various methods and disguises to track down the villains.

[2][3] TV Guide wrote of the film, "a lifeless effort...The gangster premise is merely an excuse for Lucan to try out some humorous bits (in drag, of course), but the picture is too padded to hold much interest.