"Round & Round" is a song by American band Selena Gomez & the Scene. The song was written and produced by Kevin Rudolf, Andrew Bolooki, and Jeff Halavacs, and co-written by Jacob Kasher and Fefe Dobson. It was released on June 22, 2010 as the lead single from the band's second album, A Year Without Rain (2010). "Round & Round" is a dance-driven electro-pop rock song with techno beats. The song received positive reviews, with critics taking note of the song's instant attraction beyond the expected demographic. It peaked at number twenty-four on the Billboard Hot 100, becoming the band's highest charting single in the United States at the time. It charted moderately in several international markets, including Canada, Germany, and the United Kingdom. Gomez & the Scene performed the song multiple times.

"Round & Round" is a dance-driven electro-pop rock song with a length of three minutes and five seconds, composed by Kevin Rudolf, Andrew Bolooki, and Jeff Halavacs, Jacob Kasher and Fefe Dobson. The song's disco influence was noted to be new for Gomez's usual "poppy" music. Mikael Wood of Billboard said the song "rides a fist-pumping electro groove". According to Amar Toor of AOL Radio Blog, the song pulls influence from Kylie Minogue circa 2001. The song's lyrics speak of a relationship going around in circles.

Tim Sendra of Allmusic said that the song was "well sung" and noted it as one of the top tracks on the album. Becky Bain of Idolator said the song had an "infectious tune", and said "might actually be the song to get the non-Disney-centric demographic interested in Selena's tunes." Although commenting that the "glossy electro-pop rock" of the song showed a sophisticated side of Gomez, and the lyrics showed emotional growth, Robert Cospey of Digital Spy said the good work was squandered by the "rusty" chorus. Overall, Copsey complimented Gomez for "avoiding the predictable Hilary/Miley teen-rawk route" and recommended she stay under the Disney umbrella to "perfect her craft further".

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