The Deer Hunter is a 1978 American epic war drama film co-written and directed by Michael Cimino about a trio of steelworkers whose lives were changed forever 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 playing 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 writer/director Michael 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, and ended up costing $15 million. The scenes depicting Russian roulette were highly controversial after the film's release. EMI Films, who produced the film, released the film internationally while Universal Pictures handled its distribution in North America.

The film received acclaim from critics and audiences, with praise for Cimino's direction, the performances of its cast (particularly from De Niro, Walken, and Streep), and 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. The film marked Meryl Streep's first Academy Award nomination (for Best Supporting Actress).

It has been featured on lists of the best films ever made, such as 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."