Inherent Vice is a 2014 American period neo-noir mystery comedy film written and directed by Paul Thomas Anderson, based on the 2009 novel of the same name by Thomas Pynchon. The ensemble cast includes Joaquin Phoenix, Josh Brolin, Owen Wilson, Katherine Waterston, Eric Roberts, Reese Witherspoon, Benicio del Toro, Jena Malone, and Joanna Newsom. The film follows Larry "Doc" Sportello, a well-intentioned but fumbling stoner, hippie, and private investigator embroiled in the criminal underworld of 1970 Los Angeles, investigating three cases linked by the disappearance of his ex-girlfriend and her wealthy new boyfriend.

Anderson's adaptation of Inherent Vice had been in development since 2010; it is the first and so far only Pynchon novel to be adapted for the screen. It is Anderson's second collaboration with Phoenix, following The Master (2012), and involves a number of his other recurring collaborators, including producers Daniel Lupi and JoAnne Sellar, cinematographer Robert Elswit, editor Leslie Jones, and composer Jonny Greenwood.

Inherent Vice premiered at the New York Film Festival on October 4, 2014, and began a limited theatrical release in the United States on December 12, 2014, by Warner Bros. Pictures. The film received generally positive reviews from critics, with many praising the performances, costumes and screenplay, but some criticizing the complicated plot. It was nominated for several awards, including two at the 87th Academy Awards and Best Actor – Motion Picture Musical or Comedy for Phoenix at the 72nd Golden Globe Awards. The National Board of Review named it one of the ten best films of the year. Some critics said that Inherent Vice has the makings of a cult film. In 2016, it was voted the 75th best film since 2000 in an international critics' poll.