Harlequin is a soundtrack album by singer-songwriter Lady Gaga, released on September 27, 2024, through Interscope Records. It serves as a "companion album" to the 2024 American musical thriller film Joker: Folie à Deux, in which she portrays Harleen "Lee" Quinzel. The album is made up of songs featured on the film's soundtrack, as well two original pieces composed for the project. At the film's red carpet premiere in London, England, on September 25, 2024, Gaga discussed the inspiration for the album, stated, "When we were done with the movie, I wasn't done with her. Because I'm not done with her, I made Harlequin." She also described it as an "indicative of a complex woman that wants to be whoever she wants to be at any given moment."