The Second Mate is a 1950 British crime film directed by John Baxter and starring Gordon Harker, Graham Moffatt and David Hannaford.

The Monthly Film Bulletin wrote: "The Second Mate is an economically made comedy thriller, designed to introduce the comedy team of Gordon Harker, Graham Moffat and David Hannaford, and made partly on Thames-side locations.

The intention is commendable but The Second Mate, unfortunately, suffers from rather inexpert direction, a confused story (slow moving until the final chase scenes) and a comedy technique which relies over much on the familiar mannerisms of Gordon Harker.

it is young David Hannaford's engaging performance in what is tantamount to the lead, and the picturesque backgrounds, rather than the extravagant plot that prevent it from shipping water.

"[4] In British Sound Films: The Studio Years 1928–1959 David Quinlan rated the film as "mediocre", writing: "Slow, rather crudely made comedy-thriller that even Harker's experience can't save.