Rambo is a 2008 American war action film directed and co-written by Sylvester Stallone, based on the character John Rambo created by author David Morrell for his novel First Blood. A sequel to Rambo III (1988), it is the fourth installment in the Rambo film series and co-stars Julie Benz, Paul Schulze, Matthew Marsden, Graham McTavish, Rey Gallegos, Tim Kang, Jake La Botz, Maung Maung Khin, and Ken Howard. The film is dedicated to the memory of Richard Crenna, who died in 2003. Crenna had played Colonel Sam Trautman in the previous films. In the film, Rambo (reprised by Stallone) leads a group of mercenaries into Burma to rescue Christian missionaries, who have been kidnapped by a local infantry unit.

The rights to the Rambo franchise were sold to Miramax Films in 1997 after Carolco Pictures went bankrupt. Miramax intended to produce a fourth film but Stallone was unmotivated to reprise the role. The rights were then sold to Nu Image and Millennium Films in 2005, who green-lit the film before the release of Rocky Balboa (2006). Filming began in Thailand, Mexico, and the United States in January 2007, and ended in May 2007.

Rambo was theatrically released in the United States by Lionsgate Films and the Weinstein Company on January 25, 2008, and in Germany by Warner Bros. Pictures on February 14, to mixed reviews, with praise aimed at Stallone’s direction and performance, action sequences, and musical score, but criticism for its plot, excessively graphic violence, and political commentary. It was also a box office success. It grossed $113.2 million worldwide against a production budget between $47.5–50 million. The film was followed by Rambo: Last Blood, released on September 20, 2019.