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Bad Blood is een nummer van de Amerikaanse zangeres Taylor Swift van haar vijfde studioalbum 1989, dat in 2014 uitkwam. De versie samen met de Amerikaanse rapper Kendrick Lamar werd op 17 mei 2015 in de VS uitgebracht door Big Machine Records als de vierde single van Swifts album. De single verscheen een dag later in Nederland en België. Het nummer gaat over verraad van een beste vriend of vriendin.

"Bad Blood" is a song by the American singer-songwriter Taylor Swift from her fifth studio album, 1989 (2014). She wrote the song with the Swedish producers Max Martin and Shellback. It is a pop song using keyboards and hip-hop–inspired drum beats, and the lyrics are about betrayal by a close friend. A remix featuring the American rapper Kendrick Lamar, with additional lyrics by Lamar and production by the Swedish musician Ilya, was released to radio as 1989's fourth single on May 17, 2015, by Big Machine and Republic Records.

Music critics gave the album version of "Bad Blood" mixed reviews; some described it as catchy and engaging, but others criticized the production as bland and the lyrics repetitive. The remix version received somewhat more positive comments for Lamar's verses, featured among the best songs of 2015 on lists by NME and PopMatters, and received a Grammy nomination for Best Pop Duo/Group Performance. Critics have retrospectively considered "Bad Blood" one of Swift's worst songs. The single reached number one and received multi-platinum certifications in Australia, Canada, and the United States.

Directed by Joseph Kahn and produced by Swift, the music video for "Bad Blood" features an ensemble cast consisting of female singers, actresses, and models. Having a production that resembles sci-fi and action movies, it won the Grammy Award for Best Music Video and MTV Video Music Awards for the Video of the Year and Best Collaboration. Swift performed "Bad Blood" on the 1989 World Tour (2015), the Reputation Stadium Tour (2018), and the Eras Tour (2023–2024). Following a 2019 dispute regarding the ownership of Swift's back catalog, she re-recorded both the album version and the Lamar remix for her 2023 re-recorded album 1989 (Taylor's Version); both re-recordings are subtitled "Taylor's Version".