Warn That Man is a 1943 British comedy thriller film directed by Lawrence Huntington and starring Gordon Harker, Raymond Lovell and Finlay Currie.It was based on the 1941 play Warn That Man! by Vernon Sylvaine which had run for ten months on the West End stage, with Harker reprising his original role. The film was made at Welwyn Studios, with sets designed by the art director Charles Gilbert.

The plot is noted for the similarity of the later The Eagle Has Landed which also concerns a plot to kidnap Winston Churchill from rural England.