There Will Be Blood is a 2007 American epic period drama film written and directed by Paul Thomas Anderson, loosely based on the 1927 novel Oil! by Upton Sinclair. It stars Daniel Day-Lewis as Daniel Plainview, a silver-miner-turned-oilman on a ruthless quest for wealth during Southern California's oil boom of the late 19th and early 20th centuries. Paul Dano, Kevin J. O'Connor, Ciarán Hinds, and Dillon Freasier also feature in the film.

The film was produced by Ghoulardi Film Company and distributed by Paramount Vantage and Miramax Films. At the 2008 Berlin International Film Festival it won the Silver Bear Award for Best Director and a Special Artistic Contribution Award for Jonny Greenwood's score. The film grossed $76.2 million worldwide against its $25 million budget.

There Will Be Blood received widespread critical acclaim for its cinematography, direction, screenplay, and the performances of Day-Lewis and Dano. Day-Lewis would go on to win the Oscar, BAFTA, Golden Globe, Screen Actors Guild, NYFCC and IFTA Best Leading Actor awards for the role. It has been widely regarded by critics as one of the greatest films of the 21st century, and it appeared on many critics' "top ten" lists for 2007, including the American Film Institute, the National Society of Film Critics, the National Board of Review, and the Los Angeles Film Critics Association. At the 80th Academy Awards, the film was nominated for eight Oscars (tying with another Paramount Vantage/Miramax co-production No Country for Old Men). The nominations included Best Picture, Best Director and Best Adapted Screenplay for Anderson. Along with Day-Lewis' Oscar for Best Actor, Robert Elswit won the award for Best Cinematography.