Manxmouse: The Mouse Who Knew No Fear is a 1968 children's novel by Paul Gallico. The plot is an epic narrative of the adventures of a creature called a Manx Mouse as he meets and interacts with other people, climaxing in a meeting with a Manx cat who characters say is destined to eat him.

Paul William Gallico was an American novelist and short story and sports writer. Many of his works were adapted for motion pictures. He is perhaps best remembered for The Snow Goose, his most critically successful book, for the novel The Poseidon Adventure, primarily through the 1972 film adaptation, and for four novels about the beloved character of Mrs. Harris.