Cinderella Man is a 2005 American drama film directed by Ron Howard. The film stars Russell Crowe, Renée Zellweger and Paul Giamatti. It tells the true story of heavyweight boxing champion James J. Braddock, who was dubbed "The Cinderella Man" by journalist Damon Runyon. This is the second collaboration for Howard and Crowe, the first being A Beautiful Mind (2001).

Alfred Damon Runyon was an American journalist and short-story writer.