Rocky IV is a 1985 American sports drama film starring, written and directed by Sylvester Stallone. The film is the sequel to Rocky III (1982) and the fourth installment in the Rocky film series. It also stars Talia Shire, Burt Young, Carl Weathers, Brigitte Nielsen, and Dolph Lundgren. In the film, Rocky Balboa (Stallone) confronts Ivan Drago (Lundgren), a Soviet boxer responsible for another personal tragedy in Balboa's life.

Development for a fourth Rocky film began soon after the success of Rocky III. Principal photography began in 1984, with filming locations including Philadelphia, Wyoming, and Vancouver. Rocky IV was Lundgren's American film debut, and Stallone's last directorial effort until 2006; they engaged in authentic punching in their fight scenes, which led to Stallone being admitted to intensive care. Filming also featured new special effects and bona fide, groundbreaking sport methods and equipment, some of which were years removed from public use. Rocky IV is known for its strong Cold War themes, as well as its successful theme songs "Burning Heart" and "Living in America".

Rocky IV premiered in Los Angeles on November 21, 1985, and was theatrically released in the United States by MGM/UA Entertainment Co. under its United Artists label on November 27. The film initially received mixed reviews, with praise for Drago's credibility as a villain, but criticized the predictable screenplay. Scholars note that Drago's ultimate defeat and the Soviet crowd's embrace of Rocky represented the dissolution of the Soviet Union, while others criticized the film as propaganda through its Cold War themes and negative portrayals of Russians.

The film was a box office success, grossing $300.5 million worldwide, becoming the highest grossing film in the franchise and the third highest-grossing film of 1985 domestically and the second highest grossing film worldwide. Critical reception of the film became more favorable in the years later, with praise for the training montages. The film has been considered an icon of 1980s pop culture, and it has also gained a cult following. In 2021, a director's cut was released with the title Rocky IV: Rocky vs Drago, receiving positive reviews from critics. Another sequel, Rocky V, was released in 1990.