Step Brothers is a 2008 comedy film directed by Adam McKay, produced by Judd Apatow and starring Will Ferrell and John C. Reilly, who last teamed up in Talladega Nights (2006). The film was released on July 25, 2008. The screenplay was written by Ferrell and McKay, from a story written by Ferrell, McKay and Reilly. Jimmy Miller and Judd Apatow are the two producers of the film.

The film has been rated R by the MPAA for "crude and sexual content, and pervasive language."