Todd Phillips (born Todd Philip Bunzl; December 19, 1970) is an American filmmaker. Phillips began his career in 1993 and directed films in the 2000s such as Road Trip, Old School, Starsky & Hutch, and School for Scoundrels. He came to wider prominence in the early 2010s for directing The Hangover film series. In 2019, he co-wrote and directed the psychological thriller film Joker, based on the DC Comics character of the same name, which premiered at the 76th Venice International Film Festival where it received the top prize, the Golden Lion. Joker went on to earn Phillips three Academy Award nominations for Best Picture, Best Director, and Best Adapted Screenplay, with his co-writer Scott Silver, his second, third, and fourth Academy Award nominations after also being nominated for Best Adapted Screenplay for Borat at the 79th Academy Awards.

Phillips was born in Brooklyn, New York City, to a Jewish family. He was raised in Dix Hills, New York, on Long Island. He attended New York University Film School, but dropped out because he could not afford to complete his first film and pay tuition simultaneously. Around that time, he worked at Kim's Video and Music.

Phillips appeared as one of the drivers in the first season of the HBO hidden camera docu-series Taxicab Confessions. In a New York Times profile, Phillips said he had gotten in trouble for shoplifting as a young man.

Phillips's first documentary film, Hated: GG Allin and the Murder Junkies, centered on the life and death of controversial punk rocker GG Allin, while as a junior at NYU. It went on to become one of the highest grossing student films at the time, even getting a limited theatrical release. Phillips wrote a letter to convicted serial killer, John Wayne Gacy, an acquaintance of GG, asking if he could paint a movie poster for the film. Phillips stated that "Gacy is really the executive producer" of the film, having raised $10,000 from selling replicas of his artwork.

Next, he co-directed with then-partner Andrew Gurland for Frat House, a second documentary about college fraternities; it premiered at the 1998 Sundance Film Festival and won the Grand Jury Prize for documentary features. It was produced by HBO, but never aired on its channel because some of the film's participants claimed their activities onscreen were staged reenactments.

His third documentary Bittersweet Motel centered on the jam band Phish, covering its summer and fall 1997 tours, plus footage from their 1998 spring tour of Europe. It ends at The Great Went, a two-day festival held in upstate Maine which attracted 70,000 people. While at Sundance with Frat House, Phillips met director-producer Ivan Reitman who led Phillips into writing and directing his comedy films, Road Trip and Old School, for Reitman's Montecito Picture Company.

Phillips also wrote and directed the 2004 film Starsky & Hutch starring Ben Stiller and Owen Wilson, as well as the 2006 film School for Scoundrels, starring Billy Bob Thornton and Jon Heder. In 2005, Details Magazine cited Judd Apatow, Adam McKay and Phillips as "The Frat Packagers". He worked on the satirical comedy Borat (2006), but he resigned his position as a director in early 2005, due to creative differences. Nevertheless, he was nominated for an Academy Award for Best Adapted Screenplay for his role in fashioning the story.

After establishing Green Hat Films in 2008, Phillips directed and produced The Hangover. Made for a reported $35 million, it went on to become the highest-grossing R-rated comedy up to that time. Its worldwide gross stood at $480 million on February 3, 2012. The film went on to win the Golden Globe for Best Picture (Musical or Comedy). It also won Best Comedy at the 2009 Broadcast Film Critics Awards. Phillips took almost no up-front salary in exchange for a large share of the film's profits, and has said that the movie's enormous success, combined with his deal, makes it "my Star Wars". After a worldwide gross of $467 million, his share in the film made Phillips around $50 million.