The Deer Hunter is a 1978 American epic war drama film co-written and directed by Michael Cimino about a trio of Slavic-American steelworkers whose lives are upended after fighting in the Vietnam War. The three soldiers are played by Robert De Niro, Christopher Walken and John Savage, with John Cazale (in his final role), Meryl Streep and George Dzundza in supporting roles. The story takes place in Clairton, Pennsylvania, a working-class town on the Monongahela River south of Pittsburgh, and in Vietnam.

The film was based in part on an unproduced screenplay called The Man Who Came to Play by Louis A. Garfinkle and Quinn K. Redeker about Las Vegas and Russian roulette. Producer Michael Deeley, who bought the script, hired Cimino who, with Deric Washburn, rewrote the script, taking the Russian roulette element and placing it in the Vietnam War. The film went over-budget and over-schedule, costing $15 million. Its producers EMI Films released it internationally, while Universal Pictures handled its North American distribution.

The Deer Hunter received acclaim from critics and audiences, with praise for Cimino's direction, the performances of its cast, its screenplay, realistic themes and tones, and cinematography. It was also successful at the box office, grossing $49 million. At the 51st Academy Awards, it was nominated for nine Academy Awards, and won five: Best Picture, Best Director for Cimino, Best Supporting Actor for Walken, Best Sound, and Best Film Editing. It was Meryl Streep's first Academy Award nomination (for Best Supporting Actress).

The Deer Hunter has been included on lists of the best films ever made, including being named the 53rd-greatest American film of all time by the American Film Institute in 2007 in their 10th Anniversary Edition of the AFI's 100 Years...100 Movies list. It was selected for preservation in the United States National Film Registry by the Library of Congress in 1996, as being "culturally, historically, or aesthetically significant."