Captains of the Clouds (a.k.a. Shadows of Their Wings) is a 1942 American war film in Technicolor, directed by Michael Curtiz and starring James Cagney. It was produced by William Cagney (Cagney's brother), with Hal B. Wallis as executive producer. The screenplay was written by Arthur T. Horman, Richard Macaulay, and Norman Reilly Raine, based on a story by Horman and Roland Gillett. The cinematography was by Wilfred M. Cline and Sol Polito and was notable in that it was the first feature-length Hollywood production filmed entirely in Canada.The film stars James Cagney and Dennis Morgan as Canadian pilots who do their part in the Second World War, and features Brenda Marshall, Alan Hale Sr., George Tobias, Reginald Gardiner, and Reginald Denny in supporting roles. The title of the film came from a phrase used by Billy Bishop, the First World War fighter ace, who played himself in the film. The same words are also echoed in the narration of The Lion Has Wings documentary (1939).

A film on the ongoing Canadian involvement made sense for the American war effort. The film ends with an epilogue chronicling the contributions of the Royal Canadian Air Force (RCAF) to the making of the film.