Who'll Stop the Rain is a 1978 American crime war film directed by Karel Reisz and starring Nick Nolte, Tuesday Weld, Michael Moriarty, and Anthony Zerbe. It was released by United Artists and produced by Herb Jaffe and Gabriel Katzka with Sheldon Schrager and Roger Spottiswoode as executive producers. The screenplay was by Judith Rascoe and Robert Stone, based on Stone's novel Dog Soldiers (1974), the music score by Laurence Rosenthal, and the cinematography by Richard H. Kline. The movie was entered in the 1978 Cannes Film Festival.

Karel Reisz was a Czech-born British filmmaker and film critic, one of the pioneers of the new realist strain in British cinema during the 1950s and 1960s. Two of the best-known films he directed are Saturday Night and Sunday Morning (1960), a classic of kitchen sink realism, and the romantic period drama The French Lieutenant's Woman (1981).