Begin Again is a 2013 American musical comedy-drama film written and directed by John Carney, and starring Keira Knightley and Mark Ruffalo. Knightley plays a singer-songwriter who is discovered by a struggling record label executive (Ruffalo) and collaborates with him to produce an album recorded in public locations all over New York City.

After the success of his 2007 musical film Once, Carney wrote the script for Begin Again in 2010 and employed Gregg Alexander to compose most of the film's music. With a US$8 million budget, production began in July 2012 with filming taking place in various locations around New York City. The film premiered in September 2013 at the Toronto International Film Festival and was released theatrically on June 27, 2014, in conjunction with the release of the film's soundtrack. It has grossed over $63 million worldwide and received mostly positive reviews from critics. It was nominated for an Academy Award for Best Original Song for "Lost Stars".