Old Mother Riley is a British comedy film directed by Oswald Mitchell and starring Arthur Lucan, Kitty McShane, Barbara Everest, Patrick Ludlow and Hubert Leslie. Mother Riley and her daughter stop the plans of some disinherited relatives to overturn the terms of a will. It was the first in the Old Mother Riley series of films.

A night watchman is being bludgeoned, as a safe is cracked open in the offices of the District Food Controller. A list of wartime foods to be rationed is stolen, and the police fear gangsters are planning to sell the foods on the black market. 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.

Mrs. Riley is tricked out of her license for a pub and joins her daughter in Portugal.

Old Mother Riley loses her laundry job and then battles her ex-boss in a parliamentary election.

The 13th film in the Old Mother Riley series.

Mother Riley plays a nurse who was forced to volunteer for the Auxiliary Territorial Service. Mayhem ensues until she is able to prevent German spies from acquiring important documents.

Old Mother Riley starts a new business.

Old Mother Riley does the laundry for the dancers in the pantomime "Aladdin", where her daughter Kitty works as a chorus girl. Sneaking a peek at the show one day, Mother Riley accidentally pops up through a trap door onto the stage. Accosted by the angry star, Mother Riley’s belligerent responses have the audience in stitches. Outraged, the star walks out, leaving Kitty to take over the leading role, to great success.

Old Mother Riley gets involved in a plot to steal an invention

Mother Riley takes over a circus on the point of closing down, and makes it a success.