Red Harvest (1929) is a novel by Dashiell Hammett. The story is narrated by a nameless detective, The Continental Op, a frequent character in Hammett's fiction. The Op's client is killed before the two men meet, and, for reasons the reader can only guess, the Op decides to clean up the gang-filled city known as "Poisonville."

It has been frequently asserted--though never officially corroborated--that the plot was the inspiration for Yōjimbō, a 1961 film by Akira Kurosawa. Yōjimbō was later remade as A Fistful of Dollars (1964), a spaghetti western directed by Sergio Leone and starring Clint Eastwood; A Fistful of Dollars was in turn remade as a 1920s-era "gangster" movie in Last Man Standing (1996), starring Bruce Willis.

The film Miller's Crossing (1990) by the Coen brothers contains stylistic and narrative elements of Red Harvest as well as several other Hammett works. The Coens' film Blood Simple (1984) takes its title from a line in Red Harvest.