Margin Call is a 2011 American drama film written and directed by J. C. Chandor in his feature directorial debut. The principal story takes place over a 24-hour period at a large Wall Street investment bank during the initial stages of the 2008 financial crisis. It focuses on the actions taken by a group of employees during the subsequent financial collapse. The title comes from a finance term for when an investor must increase the securities or other assets used as collateral for a loan when their value falls below a certain threshold. The film stars an ensemble cast consisting of Kevin Spacey, Paul Bettany, Jeremy Irons, Zachary Quinto, Penn Badgley, Simon Baker, Mary McDonnell, Demi Moore, and Stanley Tucci.

The film was produced by Myriad Pictures, Benaroya Pictures and Before the Door Pictures (which was the first to sign on and is owned by Zachary Quinto). It was produced in association with Washington Square Films. Theatrically, it was distributed by Lionsgate and Roadside Attractions in North America, with Myriad handling international distribution through independent distributors. The director and screenwriter, J. C. Chandor, is the son of an investment banker; the screenplay was partially informed by Chandor's own foray into real estate investments in New York City shortly before the financial crash. Preceding its theatrical release, Margin Call received positive critical reviews. Following its wide release, the film garnered award nominations from the Detroit Film Critics Society, along with several separate nominations for its screenplay and direction from recognized award organizations, including a nomination for the Academy Award for Best Original Screenplay. The score was composed by Nathan Larson.

The film premiered at the Sundance Film Festival on January 25, 2011, and opened in theaters nationwide in the United States on October 21, 2011. Though it grossed just $5.4 million in domestic ticket sales from 199 theaters, the film had a ground-breaking day-and-date release that earned more than $10 million in video-on-demand sales. The DVD and Blu-ray editions were released in the U.S. on December 20, 2011.