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Travis Bickle is the antihero protagonist of the 1976 film Taxi Driver directed by Martin Scorsese. The character was created by the film's screenwriter Paul Schrader. He is portrayed by Robert De Niro, who received Academy Award, BAFTA Award, and Golden Globe nominations for Best Lead Actor for his performance.

Travis Bickle is a 26-year-old living in New York City. When applying for a job as a taxi driver, he says he is a former U.S. Marine who served in the Vietnam War and was given an honorable discharge in May 1973, and has had "some" education. With few friends, and suffering from depression, loneliness, existential crises, and severe and chronic insomnia, he takes a job as a graveyard shift cab driver to occupy his time, working grueling 12–14 hour shifts 6–7 days a week. Working late at night in dangerous neighborhoods, his customers tend to include pimps and drug addicts. He is visibly angered by them, and begins fantasizing about "cleansing" such "filth" from the streets.

Bickle becomes attracted to a woman, Betsy (Cybill Shepherd), who works in the local campaign office of presidential candidate and United States Senator Charles Palantine. Bickle often spies on Betsy from his cab, and finally enters the office to ask her out. They meet for coffee, and Betsy finds him strange but charming, and agrees to see him again. He then takes her to a porn theater he frequents, which disgusts her and makes her refuse to see him again.

After Betsy rejects him, Bickle becomes increasingly paranoid and starts acting out his fantasies. He buys several guns and takes to carrying them secreted about his person – taped to his limbs, for example, or in hidden spring-loaded holsters. He begins a physical training regimen which consists of doing 50 pushups and 50 pullups every morning and practices an intimidating, thuggish presence in the mirror to use on whoever challenges him. Eventually, he shaves his head into a Mohawk. He attends one of Palantine's speeches, apparently intent on shooting him. However, he attracts the notice of Secret Service agents and flees.

He later becomes obsessed with protecting Iris Steensma (Jodie Foster), a 12-year-old prostitute he has seen on his route. He pays her pimp, Matthew "Sport" Higgins (Harvey Keitel), for her time, but is not interested in having sex with her; instead, he tries to persuade her to leave prostitution and return home. Iris rebuffs him, only increasing his anger and resolve to take her away from a perilous life. He confronts Sport and shoots him in the stomach, leaving him to die on the street. He then goes on a rampage through a brothel with his concealed weapons while Iris is servicing a client. Bickle shoots the approaching bouncer's hand off as soon as he walks in, but he in turn is shot in the neck from behind by a dying Sport.

Bickle begins to advance only to have the wounded bouncer attack him while going up the stairs. Iris' client, a Mafioso, overhears the previous gunshots; he sneaks up behind the distracted Bickle and shoots him in the arm. Bickle kills the mafioso and the bouncer, and then turns the gun on himself, but finds that he is out of ammunition. Severely injured, Bickle collapses on Iris' couch as she is seen crying. When the police arrive, Bickle stares at them and smiles, pointing his bloodied finger like a gun at his head.

Taxi Driver, American Gigolo, Light Sleeper, and The Walker make up a series referred to variously as the "Man in a Room" or "Night Worker" movies. Screenwriter Paul Schrader (who directed the other three films) has stated that he considers the central characters of the four films to be one character, who has changed as he has gotten older.

De Niro received a nomination for the Academy Award for Best Actor for his performance as Bickle. In the American Film Institute's AFI's 100 Years...100 Heroes & Villains, Bickle was named the 30th greatest film villain of all time. Empire magazine also ranked him 18th in their "The 100 Greatest Movie Characters" poll. Premiere ranked De Niro's performance as the 42nd best in cinematic history.

The character has often been referenced in popular culture due to his famous "You talkin' to me?" monologue. The scene was listed by IGN as the 4th best moment in film history when counting their top 100. Bickle sinisterly utters the line while he stands in front of the mirror, clad in a USMC jacket, threatening his unseen foes with the gun up his sleeve. The line has been parodied multiple times throughout film history, including by De Niro himself in the film The Adventures of Rocky and Bullwinkle. The line can also sometimes be heard in the famous game Grand Theft Auto III when the player tries to steal a taxi by forcing the driver out.

On March 30, 1981, John Hinckley Jr. attempted to assassinate United States president Ronald Reagan in an attempt to impress the actress Jodie Foster, who played Iris in Taxi Driver. Hinckley's inspirations for his assassination attempt were directly linked to Travis Bickle's attempted assassination of Charles Palantine in the film, with Hinckley even fashioning his appearance to resemble Bickle's mohawk and army jacket. Bickle's character was inspired by Arthur Bremer, who attempted to assassinate presidential candidate George Wallace on May 15, 1972. Upon hearing of Hinckley's assassination attempt, Taxi Driver director Martin Scorsese considered quitting the film industry.

Several contemporary artists have directly referenced and appropriated Travis Bickle and Taxi Driver in their artwork. These include Douglas Gordon in his video installation 'Through a looking glass'