"Swish Swish" is a song by American singer Katy Perry featuring Trinidadian-born American rapper Nicki Minaj. It was released on May 19, 2017, and serves as the third single for Perry's fifth studio album, Witness (2017). It is a house-inspired EDM song and samples "Star 69" by Fatboy Slim which in turn samples "I Get Deep" by Roland Clark. Brazilian singer Gretchen stars in the "Swish Swish" lyric video.

On May 18, 2017, Perry announced on Instagram the track would be released at midnight Eastern time. "Swish Swish" became available as a digital download along with the preorder of Witness. Soon after "Swish Swish" was released, critics wrote how the track appeared to be a diss track in response to Taylor Swift's 2014 song, "Bad Blood". When asked if the song was directed at anyone in particular on The Tonight Show Starring Jimmy Fallon, Perry simply replied that the song is an anti-bullying anthem. Additionally, Nicki Minaj's verse contains the line, "Silly rap beefs just get me more checks," which addresses Minaj's own purported "beef" with rapper Remy Ma, while also referring to her as a stan. On May 22, while appearing on Carpool Karaoke on The Late Late Show with James Corden, after singing to "Swish Swish", Corden asked Perry about a 2013 feud between her and Taylor Swift. "There's a situation," Perry said. "Honestly, it's really like she started it, and it's time for her to finish it."

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