Brokeback Mountain is a 2005 romantic drama film directed by Ang Lee. It is a film adaptation of the 1997 short story of the same name by Annie Proulx with the screenplay written by Diana Ossana and Larry McMurtry. The film stars Heath Ledger, Jake Gyllenhaal, Anne Hathaway and Michelle Williams and depicts the complex romantic and sexual relationship between two men in the American West from 1963 to 1983.

Early one morning in Signal, Wyoming, Ennis Del Mar (Heath Ledger) and Jack Twist (Jake Gyllenhaa) meet while lining up for employment with local rancher Joe Aguirre. The world which Ennis and Jack have been born into is, at once, changing rapidly and yet scarcely evolving. Both young men seem certain of their set places in the heartland -- obtaining steady work, marrying, and raising a family -- and yet they hunger for something beyond what they can articulate. When Aguirre dispatches them to work as sheepherders up on the majestic Brokeback Mountain, they gravitate towards camaraderie and then a deeper intimacy. At summer's end, the two must come down from Brokeback and part ways. Remaining in Wyoming, Ennis weds his sweetheart Alma, with whom he will have two daughters as he ekes out a living. Jack, in Texas, catches the eye of rodeo queen Lureen Newsome. Their courtship and marriage result in a son, as well as jobs in her father's business. Four years pass. One day, Alma brings Ennis a postcard from Jack, who is en route to visit Wyoming. Ennis waits expectantly for his friend, and when Jack at last arrives, in just one moment it is clear that the passage of time has only strengthened the men's attachment. In the years that follow, Ennis and Jack struggle to keep their secret bond alive. They meet up several times annually. Even when they are apart, they face the eternal questions of fidelity, commitment, and trust. Ultimately, the one constant in their lives is a force of nature -- love.

Brokeback Mountain received an 87% "Fresh" rating on Rotten Tomatoes, compiled from 223 reviews, with the consensus that "a beautifully epic Western, Brokeback Mountain's gay love story is imbued with heartbreaking universality, helped by the moving performances of Ledger and Gyllenhaal."

Brokeback Mountain won the Golden Lion at the Venice Film Festival and was honored with Best Picture and Best Director accolades from the British Academy of Film and Television Arts, Golden Globe Awards, Producers Guild of America, Critics Choice Awards, and Independent Spirit Awards among many other organizations and festivals.

Brokeback Mountain was nominated for eight Academy Awards, the most nominations at the 78th Academy Awards, where it won three: Best Director, Best Adapted Screenplay, and Best Original Score. The film was widely considered to be a front runner for the Academy Award for Best Picture, but lost to Crash. Brokeback Mountain ranks 11th among the highest-grossing romance films of all time.