"Unholy" is a song by British singer Sam Smith and German singer Kim Petras. It was released on 22 September 2022 through EMI Records and Capitol Records as the second single from Smith's fourth studio album Gloria (2023) and as a bonus track on Petras' debut studio album Feed the Beast (2023). It was teased by Smith on their TikTok account a month before its release and went viral due to its use in thirst trap-style videos. Produced by Ilya, Omer Fedi, Blake Slatkin, Jimmy Napes, and Cirkut and written by them alongside Smith and Petras, "Unholy" is a sexually charged electropop, dance-pop, and synth-pop song with choral and hyperpop influences. It uses the Phrygian dominant scale and its lyrics are about a family man who cheats on his wife at a strip club.