Let It Rain is a lost 1927 American silent comedy film produced by and starring Douglas MacLean, directed by Edward F. Cline, and featuring Boris Karloff in a minor role as a U.S. mail robber. Paramount Pictures distributed the film. The film is now lost.

Plot

A Marine sergeant named "Let-It-Rain" Riley falls in love with a young lady and goes AWOL in order to meet up with her before a sailor aboard his ship (who he competes with for girls) can take his shore leave to go meet her. During the events that follow, Riley and the girl expose the criminals behind a mail robbery. Riley winds up getting his commission as well as the girl.