Oh, Mr Porter! (1937) is a British comedy film starring Will Hay with Moore Marriott and Graham Moffatt and directed by Marcel Varnel. While not Hay's most commercially successful (although it grossed £500,000 at the box office), it is probably his best-known film to modern audiences. It is widely acclaimed as the best of Hay's work, and a classic of its genre. The film had its first public showing in November 1937 and went on general release on 3 January 1938. The plot of Oh, Mr Porter was loosely based on the Arnold Ridley play The Ghost Train. The title was taken from Oh! Mr Porter, a music hall song.
The British Film Institute included the film in its 360 Classic Feature Films list; Variety magazine described the movie as "amusing, if over-long", noting that there was "[n]o love interest to mar the comedy"; and the cult website TV Cream listed it at number 41 in its list of cinema's Top 100 Films.