Moneyball: The Art of Winning an Unfair Game is a book by Michael Lewis, published in 2003, about the Oakland Athletics baseball team and its general manager Billy Beane. It describes the team's sabermetric approach to assembling a competitive baseball team on a small budget. It led to the 2011 film Moneyball, starring Brad Pitt and Jonah Hill.

Moneyball is a 2011 American biographical sports drama film that was directed by Bennett Miller with a script by Steven Zaillian and Aaron Sorkin from a story by Stan Chervin. The film is based on the 2003 nonfiction book, Moneyball: The Art of Winning an Unfair Game by Michael Lewis. The book is an account of the Oakland Athletics baseball team's 2002 season and their general manager Billy Beane's attempts to assemble a competitive team. In the film, Beane and assistant general manager Peter Brand, faced with the franchise's limited budget for players, build a team of undervalued talent by taking a sophisticated sabermetric approach to scouting and analyzing players. Philip Seymour Hoffman also stars as Art Howe.