Margaret is a 2011 drama film written and directed by Kenneth Lonergan. The film stars Anna Paquin, Matt Damon, Mark Ruffalo, Kieran Culkin, Olivia Thirlby, and Rosemarie DeWitt. Margaret originally was scheduled for release in 2007 by Fox Searchlight Pictures, but was repeatedly delayed while Lonergan struggled to create a final cut he was satisfied with, resulting in multiple lawsuits.

While the studio insisted the film's running time could not exceed 150 minutes, Lonergan's preferred version was closer to three hours. Martin Scorsese and Thelma Schoonmaker contributed to editing a 150-minute version which Lonergan approved, but producer Gary Gilbert rejected the cut. Eventually, Fox Searchlight Pictures released the 150-minute film limitedly in the United States on September 30, 2011.

A three-hour extended version, incorporating extra footage and a revised score and sound mix, was subsequently released on DVD in July 2012.