Querelle is a 1982 English-language erotic art film directed by Rainer Werner Fassbinder. The film stars Brad Davis and was adapted from French author Jean Genet's 1947 novel Querelle of Brest. The plot centers on the Belgian sailor Georges Querelle, who is both a thief and murderer. It was Fassbinder's last film, released shortly after his death at the age of 37.

When Belgian sailor Georges Querelle's ship, Le Vengeur, arrives in Brest, he visits the Feria, a bar and brothel for sailors run by Madame Lysiane, whose lover, Robert, is Querelle's brother. Querelle has a love/hate relationship with his brother: when they meet at La Feria, they embrace, but also punch one another slowly and repeatedly in the belly. Lysiane's husband Nono works behind the bar and also manages La Feria's illicit affairs with the assistance of his friend Mario, the corrupt police captain.

Querelle makes a deal to sell opium to Nono. During the execution of the deal, he murders his accomplice Vic by slitting his throat. After delivering the drugs, Querelle announces that he wants to sleep with Lysiane. He knows that this means he will have to throw dice with Nono, who has the privilege of playing a game of chance with all of her prospective lovers. If Nono loses, the suitor is allowed to proceed with his affair.

If the suitor loses, he must submit to anal sex with Nono first, according to Nono's maxim: "That way, I can say my wife only sleeps with arseholes." Querelle deliberately loses the game, allowing himself to be sodomized by Nono. When Nono gloats about Querelle's "loss" to Robert, who won his dice game, the brothers end up in a violent fight. Afterwards, Querelle has sex with Mario.

Back on the ship, a builder, Gil, murders his work mate Theo, who had been harassing and sexually assaulting him. Gil hides from the police in an abandoned prison, and Roger, who is in love with Gil, establishes contact between Querelle and Gil in the hopes that Querelle can help Gil escape. Querelle falls in love with Gil, who closely resembles his brother. Gil returns his affections, but Querelle betrays Gil by tipping off the police. Querelle cleverly arranged it so that the murder of Vic is also blamed on Gil.

A perennial undercurrent in the film is that Querelle's superior, Lieutenant Seblon, is in love with Querelle, and constantly tries to prove his manliness to him. Seblon is aware that Querelle murdered Vic, but chooses to protect him.

The film ends with the sailors aboard Le Vengeur, presumably about to leave port. A heartbroken Lysiane, spurned by Querelle, conducts a tarot reading for Robert: she realizes that he and Querelle were never brothers after all. As Lysiane laughs maniacally, we see Querelle's birth record transcribed on-screen.

According to Genet's biographer Edmund White, Querelle was originally going to be made by Werner Schroeter, with a scenario by Burkhard Driest, and produced by Dieter Schidor. Schidor could not find the money to finance a film by Schroeter, and therefore turned to other directors, including John Schlesinger and Sam Peckinpah, before settling on Fassbinder. Driest wrote a radically different script for Fassbinder, who then "took the linear narrative and jumbled it up".