The Mysterious Mr. Nicholson[a] is a 1947 British crime film directed by Oswald Mitchell and starring Anthony Hulme, Lesley Osmond and Frank Hawkins.

The plot concerns a valuable inheritance, murder, confusions of identity, and a mysterious crime boss.

Nearing the address, she bumps into a stranger and after finds a body (who turns out to be the client) lying murdered.

"[3] Kine Weekly wrote: "Its plot, which hinges on the hero's striking resemblance to a crook, is unabashed 'penny dreadful, but the leading players are reasonably convincing and the direction is not lacking in resource.

"[4] Picturegoer wrote: "The story is embellished with a music hall sequence, and songs, and has a certain rough robustness which makes for quite acceptable entertainment.