"Swish Swish" is a song by American singer Katy Perry featuring Trinidadian rapper Nicki Minaj from the former's fifth studio album Witness. The song was initially released as a promotional single on May 19, 2017, and later as the album's third single. The house-inspired EDM and hip hop song was written alongside Sarah Hudson, Starrah, producer Duke Dumont, and additional producer PJ "Promnite" Sledge, with Roland Clark receiving writing credits for the sampling of his song "I Get Deep", and Noah "Mailbox" Passovoy receiving additional and vocal production credits.

The song uses basketball metaphors to address Perry's bullies and detractors. Multiple media outlets suspected that the song is about American singer-songwriter Taylor Swift and her 2015 single "Bad Blood", which was believed to be about Perry. Critics wrote mixed reviews of "Swish Swish"; some praised the track's empowering environment and Minaj's verse, while others criticized the song's lyrics.

Promotion for the track began with a live debut of the track on Saturday Night Live, with a performance that went viral. Subsequently, Perry continued to promote the track during BBC Radio 1's Big Weekend, the Glastonbury Festival 2017 and The Voice Australia. Later, to further promote the track, a lyric video for the track, featuring Brazilian singer Gretchen, was released on July 3, 2017. The official music video, directed by Dave Meyers, premiered on August 24, 2017. Three days later, Perry and Minaj performed the track together for the first time during the 2017 MTV Video Music Awards. "Swish Swish" reached the top 10 in the Philippines, in addition to the top 20 in Canada and the United Kingdom as well as the top 30 in Australia and Ireland. It has also been certified platinum in Australia, Canada and the US, and was featured in the video game Just Dance 2018.