The Theory of Everything is a 2014 biographical romantic drama film directed by James Marsh. Set at the University of Cambridge, it details the life of the theoretical physicist Stephen Hawking. It was adapted by Anthony McCarten from the 2007 memoir Travelling to Infinity: My Life with Stephen by Jane Hawking, which deals with her relationship with her ex-husband Stephen Hawking, his diagnosis of amyotrophic lateral sclerosis (ALS), and his success in the field of physics. The film stars Eddie Redmayne and Felicity Jones, with Charlie Cox, Emily Watson, Simon McBurney, Christian McKay, Harry Lloyd, and David Thewlis featured in supporting roles. The film had its world premiere at the 2014 Toronto International Film Festival on 7 November 2014. It had its UK premiere on 1 January 2015.

A biographical film or biopic is a film that dramatizes the life of an actual person or group of people. Such films show the life of a historical person and the central character's real name is used. They differ from docudrama films and historical drama films in that they attempt to comprehensively tell a single person's life story or at least the most historically important years of their lives.