"E.T." is a song by American singer Katy Perry taken from her third studio album, Teenage Dream (2010). She co-wrote the song with its producers Dr. Luke, Max Martin, and Ammo. "E.T." was serviced to radio stations as the album's fourth single on February 16, 2011. One version of the song features verses from American rapper Kanye West. Musically, it is an electronic and hip hop ballad which draws heavily from dubstep and techno, along with smaller amounts of drum and bass. Lyrically, the song speaks of "falling in love with a foreigner," according to Perry.

The song became Perry's fifth non-consecutive number one on the U.S. Billboard Hot 100, and also topped charts in Canada, New Zealand and Poland. To date, "E.T." has sold over six million digital downloads worldwide, making it one of the best-selling singles worldwide and Perry's third highest selling song in the U.S. According to Billboard, it was the fourth biggest song of 2011.

To promote the song, Perry and West performed on the tenth season of American Idol, the 54th Grammy Awards, and at Madison Square Garden for Z100's Jingle Ball. Floria Sigismondi directed the song's music video, which shows Perry as an evolving alien drifting in outer space before landing on an abandoned litter-covered Earth, while clips of large felines hunting game are interspersed. The video garnered positive reviews from music critics.

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