The Social Network is a 2010 American biographical drama film directed by David Fincher and written by Aaron Sorkin, based on the 2009 book The Accidental Billionaires by Ben Mezrich. It portrays the founding of social networking website Facebook. It stars Jesse Eisenberg as Facebook founder Mark Zuckerberg, with Andrew Garfield as Eduardo Saverin, Justin Timberlake as Sean Parker, Armie Hammer as Cameron and Tyler Winklevoss, and Max Minghella as Divya Narendra. Neither Zuckerberg nor any other Facebook staff were involved with the project, although Saverin was a consultant for Mezrich's book.

Production began when Sorkin signed to write it. Principal photography began that same year in October in Cambridge, Massachusetts, and lasted until November. Additional scenes were shot in California, in the cities of Los Angeles and Pasadena. Trent Reznor and Atticus Ross of Nine Inch Nails composed the film's award-winning score, which was released on September 28, 2010.

The film premiered at the New York Film Festival on September 24, 2010, and was released theatrically in the United States on October 1, by Sony Pictures Releasing. A major critical and commercial success, the film grossed $224 million on a $40 million budget and was widely acclaimed by critics. It was named one of the best films of the year by 78 critics, and named the best by 22 critics, the most of any film that year. It was also chosen by the National Board of Review as the best film of 2010. At the 83rd Academy Awards, it received eight nominations, including for Best Picture, Best Director, and Best Actor for Eisenberg, and won for Best Adapted Screenplay, Best Original Score, and Best Film Editing. It also received awards for Best Motion Picture – Drama, Best Director, Best Screenplay, and Best Original Score at the 68th Golden Globe Awards.

The Social Network has maintained a strong reputation since its initial release, and is commonly ranked by critics as one of the best films of the 2010s and 21st century. The Writers Guild of America ranked Sorkin's screenplay the third greatest of the 21st century. The factual accuracy is however largely contested. In 2024, the film was selected for preservation in the United States National Film Registry by the Library of Congress as being "culturally, historically, or aesthetically significant". While no official sequel has been announced, Sorkin has publicly expressed interest and willingness to write a screenplay for one should Fincher return to direct.