"Bad Romance" is a song by American singer Lady Gaga from her third extended play, The Fame Monster (2009). It was written and produced by Gaga and RedOne. Lyrically, "Bad Romance" explores Gaga's attraction to individuals with whom romance never works, her preference for lonely relationships and the paranoia she experienced while on tour. Following an illegal demo leak, Gaga showcased the final product at Alexander McQueen's show at the Paris Fashion Week in October 2009, followed by the release of the single's cover art. Musically, "Bad Romance" features a spoken bridge, a full-throated chorus and sung lyrics about being in love with one's best friend. The song, which is imbued with elements of Germanesque house and techno, as well as music from 1980s and the 1990s, was touted by Gaga as an experimental pop record. The song contains a few lines in French.

Most commentators were enticed by "Bad Romance", which they declared one of the highlights of The Fame Monster album. It was included in the 'best-of' lists in several media outlets such as Rolling Stone and Pitchfork Media, and acquired two Grammy Awards for Best Female Pop Vocal Performance and Best Short Form Music Video. In the United States, "Bad Romance" peaked at number two on the Billboard Hot 100, and it has been certified eleven-times platinum by the Recording Industry Association of America (RIAA), having sold 5.6 million digital downloads as of April 2016. It achieved worldwide success by topping the charts in a variety of markets, ultimately selling 12 million copies worldwide, thus becoming one of the best-selling singles of all time.

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