Star Trek V: The Final Frontier is a 1989 American science fiction film released by Paramount Pictures. It is the fifth feature in the franchise and the penultimate to star the cast of the original Star Trek science fiction television series. Taking place shortly after the events of Star Trek IV: The Voyage Home, the plot follows the crew of the USS Enterprise-A as they confront a renegade Vulcan, Sybok, who is searching for God at the center of the galaxy.

The film was directed by cast member William Shatner, following two films directed by his co-star, Leonard Nimoy. Shatner also developed the initial storyline in which Sybok searches for God, but instead finds Satan. The original script was disliked by series creator Gene Roddenberry, while Nimoy and DeForest Kelley objected to the premise that their characters, Spock and Leonard McCoy, would betray Shatner's James T. Kirk. The script went through multiple revisions to please the cast and studio, including cuts in the effects-laden climax of the film. Despite a writers' guild strike cutting into the film's preproduction, Paramount commenced filming in October 1988.

Many Star Trek veterans assisted in the production; art director Nilo Rodis developed the designs for many of the film's locales, shots and characters, while Herman Zimmerman served as production designer. Production problems plagued the film on set and during location shooting in Yosemite National Park and the Mojave Desert. As effects house Industrial Light & Magic's best crews were busy and too expensive, the production used Bran Ferren's company for the film's effects, which had to be revised several times to keep down costs. The film's ending was reworked because of poor test audience reaction and the failure of planned special effects. Jerry Goldsmith, composer for Star Trek: The Motion Picture, returned to score The Final Frontier.

The Final Frontier was released in North America on June 9, 1989, amidst a summer box office crowded by sequels and blockbuster films. It had the highest opening gross of any film in the series at that point and was number one its first week at the box office, but its grosses quickly dropped in subsequent weeks. The film received generally mixed or poor reviews by critics on release, and according to its producer nearly killed the franchise. The next entry in the series, Star Trek VI: The Undiscovered Country, received a kinder reception.