Raging Bull is a 1980 American biographical sports drama film directed by Martin Scorsese and starring Robert De Niro, Joe Pesci, Cathy Moriarty, Theresa Saldana, Frank Vincent and Nicholas Colasanto (in his final film role). The film is an adaptation of former middleweight boxing champion Jake LaMotta's 1970 memoir Raging Bull: My Story. It follows the career of LaMotta (played by De Niro), his rise and fall in professional boxing, and his turbulent personal life beset by rage and jealousy.

Scorsese was initially reluctant to develop the project, although he eventually came to relate with LaMotta's story. Paul Schrader rewrote Mardik Martin's first screenplay, and Scorsese and De Niro together made uncredited contributions thereafter. Pesci was a relatively unknown actor prior to the film, as was Moriarty, whom Pesci suggested for her role. During principal photography, each of the boxing scenes was choreographed for a specific visual style, and De Niro gained approximately 60 pounds (27 kg) to portray LaMotta in his later years.

Scorsese was exacting in the process of editing and mixing the film, expecting it to be his last major feature. Scorsese closely studied Luchino Visconti's Rocco and His Brothers, especially the way the fight scenes are filmed, a technique he integrated into Raging Bull. In addition, Scorsese was inspired by the character of Rocco (Alain Delon played the professional boxer) to help shape De Niro's interpretation of Jake LaMotta.

Raging Bull premiered in New York City on November 14, 1980, and was released in theaters on December 19, 1980. The film had a lukewarm box office of $23.4 million against its $18 million budget. The film received mixed reviews on its release. While De Niro's performance and the editing were widely acclaimed, its violent content received criticism. Despite the mixed reviews, the film was nominated for eight Academy Awards at the 53rd Academy Awards (tying with The Elephant Man as the most nominated film of the ceremony), including Best Picture and Best Director, and won two: Best Actor for De Niro (his second Oscar) and Best Editing.

After its release, Raging Bull went on to receive high critical praise, and is now considered one of the greatest films ever made. In 1990, it became the first film to be selected in its first year of eligibility for preservation in the United States National Film Registry by the Library of Congress as being "culturally, historically, or aesthetically significant", and the American Film Institute ranked it as the fourth-greatest American movie of all time.

In 1941, Jake LaMotta is a young up-and-coming middleweight boxer who suffers his first loss to Jimmy Reeves after a controversial decision. Jake's brother Joey discusses a potential shot for the middleweight title with one of his Mafia connections, Salvy Batts. Still, he repeatedly refuses the Mafia's help, wanting to win the championship on his terms.

Jake spots a 15-year-old girl named Vickie at a swimming pool in his Bronx neighborhood. He eventually pursues a relationship with her, despite his being already married and Vickie being underage. In 1943, Jake defeats Sugar Ray Robinson, and has a rematch three weeks later. Despite Jake dominating Robinson during the bout, the judges surprisingly rule in favor of Robinson, who Joey feels won only because he was enlisting in the Army the following week.

By 1945, Jake marries Vickie, but he is controlling and domineering over her, and constantly worries that she has feelings for other men. His jealousy is evident when he brutally beats his next opponent, Tony Janiro, in front of Tommy Como, the local mob boss, and Vickie. As Joey discusses the victory with journalists at the Copacabana, he is distracted by seeing Vickie approach a table with Salvy and his crew. Joey speaks with Vickie, who implies that she is dissatisfied in her marriage with Jake. Under the mistaken impression that Vickie is having an affair with Salvy, Joey viciously attacks him in a fight that spills outside of the club.