"23" is a song by American record producer Mike Will Made It, featuring American singer Miley Cyrus, and American rappers Wiz Khalifa and Juicy J; it was released on September 10, 2013 by Interscope Records. The song was written and produced by Mike Will Made It, with additional songwriting provided by Juicy J, Khalifa, Pierre Ramon Slaughter, and Rock City. "23" is set to a midtempo beat and lyrically references Air Jordan sneakers and recreational drug use.

"23" received generally mixed reviews from music critics, who were ambivalent towards its production and Cyrus' rapping ability. It peaked at number 11 on the U.S. Billboard Hot 100, and charted moderately internationally. An accompanying music video was filmed in Brooklyn on August 26, 2013, and premiered through Vevo on September 24, 2013. It received mixed reviews from critics, who were divided in their opinions of its 1990s and high school influences. Cyrus performed the song during the first leg of her ongoing Bangerz Tour.

During the production of "23", Mike Will Made It prepared a verse for himself to rap, which he originally planned to include alongside verses by Juicy J and Wiz Khalifa. However, after the latter two finished their respective recordings, Mike Will Made It decided that his contribution should be replaced by a woman. Mike Will Made It had recently finished producing Miley Cyrus' track "We Can't Stop" for her fourth studio album Bangerz (2013) when she first heard "23" and expressed interest in being included on the track. Mike Will Made It was initially hesitant of her suggestion, having met her earlier that day, although he "left her on there" after "she laid down the verse [and] killed it."

"23" is a synth-driven hip hop song set to a midtempo beat and contains elements of bass. and is distinguished in Cyrus' catalog as the first track in which she raps. In the chorus, Cyrus mentions recreational drug use, particularly in the line "I’m in the club high off purp with some shades on". The track later transitions into the repeated hook "J's on my feet" delivered by Juicy J, which references Air Jordan sneakers.

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