There Will Be Blood is a film adaptation of Upton Sinclair's novel Oil! It stars Daniel Day-Lewis and Paul Dano, and is screenwritten, produced and directed by Paul Thomas Anderson. Shooting began in mid-May 2006 in New Mexico and Marfa, Texas, with principal photography wrapping August 24, 2006. The film is scheduled for release on December 26, 2007.

Music for the film was composed by Radiohead guitarist Jonny Greenwood.

This adaptation of Oil! by Upton Sinclair, is a period piece taking place in the turn-of-the-century where a tycoon (Daniel Day-Lewis) strikes it rich after gaining oil rights to a family's ranch, turning the small town into a boomtown where a charismatic young preacher (Paul Dano) captivates churchgoers. The studio describes it as "a story about family, greed, religion, and oil, centered around a turn-of-the-century Texas prospector in the early days of the business."

It has been reported that 30 days into the shoot, the role of Eli Sunday was recast from the original choice of Kel O'Neill to the final choice of Paul Dano.