Mr. Peabody and the Mermaid is a 1948 American romantic fantasy film directed by Irving Pichel starring William Powell and Ann Blyth in the title roles.

Sequences were shot at the Weeki Wachee Springs in Florida;[1] Blyth's swimming doubles were Nancy Tribble and Mary Ann Ziegler.

After a bad bout of influenza, Peabody had gone on vacation with his wife Polly to the fictional Caribbean resort of St Hilda.

Confusion ensues as Peabody's wife Polly, who is herself attracted to suave Englishman Major Hadley, suspects her husband of infidelity with a vacationing singer.

Back at home in Boston, as snow is falling, Peabody is talked into consulting Dr. Harvey and telling his story.