Margaret "Megan" Elizabeth Ellison is an American film producer. She founded Annapurna Pictures in 2011. Her production work includes the films Zero Dark Thirty (2012), American Hustle (2013), Her (2013), and Phantom Thread (2017), all of which earned her nominations for the Academy Award for Best Picture. She is also credited as an executive producer on Nimona (2023), which was nominated for Best Animated Feature.