First Blood is a 1982 American action film directed by Ted Kotcheff and co-written by Sylvester Stallone, who stars as Vietnam War veteran John Rambo. It also co-stars Richard Crenna as Rambo's mentor Sam Trautman and Brian Dennehy as Sheriff Will Teasle. It is the first installment in the Rambo film series, followed by Rambo: First Blood Part II and is based on the 1972 novel First Blood by David Morrell, which many directors and studios had unsuccessfully attempted to adapt in the 1970s.

In the film, Rambo, a troubled and misunderstood Vietnam veteran, must rely on his combat and survival skills when a series of brutal events results in him having to survive a massive manhunt by police and government troops near the fictional small town of Hope, Washington.

First Blood was released in the United States on October 22, 1982. Initial reviews were mixed, but the film was a box office success, grossing $160.3 million and becoming the 13th highest-grossing film at the domestic box office and the seventh highest-grossing film worldwide. In 1985, it also became the first Hollywood blockbuster to be released in China, holding the record for the largest number of tickets sold for an American film until 2018. Since its release, it has been reappraised by critics with many highlighting the roles of Stallone, Dennehy and Crenna, and recognizing it as an influential film in the action genre.

The film's success spawned a franchise, consisting of four sequels (co-written by and starring Stallone), an animated television series, a comic books series, a novel series and several video games.