A Beautiful Mind is a 2001 American biographical drama film about the mathematician John Nash, a Nobel Laureate in Economics, played by Russell Crowe. The film is directed by Ron Howard based on a screenplay by Akiva Goldsman, who adapted the 1998 biography by Sylvia Nasar. In addition to Crowe, the film's cast features Ed Harris, Jennifer Connelly, Paul Bettany, Adam Goldberg, Judd Hirsch, Josh Lucas, Anthony Rapp, and Christopher Plummer in supporting roles. The story begins in Nash's days as a brilliant but asocial mathematics graduate student at Princeton University. After Nash accepts secretive work in cryptography, he becomes liable to a larger conspiracy, through which he begins to question his reality.

A Beautiful Mind was released theatrically in the United States on December 21, 2001 by Universal Pictures and internationally by DreamWorks Pictures. It went on to gross over $313 million worldwide and won four Academy Awards, for Best Picture, Best Director (Ron Howard), Best Adapted Screenplay and Best Supporting Actress (Jennifer Connelly). It was also nominated for Best Actor, Best Film Editing, Best Makeup, and Best Original Score.