"According to You" is the debut single by Australian guitarist Orianthi from her second studio album, Believe. The song was written by Andrew Frampton and Steve Diamond, and produced by Howard Benson. It was released in Australia on 6 October 2009. As it quickly gained popularity, the song was sent to mainstream radio stations in the United States and Canada in November 2009, later making impact at the rhythmic and adult contemporary formats. "According to You" was released in the UK on 6 September 2010.

The song was a commercial success, reaching the top 10 in Australia and the top 20 in the United States. It was also certified Platinum in both territories. "According to You" also charted in Canada, Japan, and New Zealand. A radio hit, the song reached the top three on the Billboard Pop Songs chart and also appeared on the Adult Contemporary, Adult Pop Songs, and Rhythmic charts.

The song was also made available as downloadable content for the Rock Band series on 4 May 2010.

"According to You" is a pop rock song with hard rock-styled instrumentation and with a duration of three minutes and nineteen seconds (3:19). It was written by Steve Diamond and Andrew Frampton, and was produced by Howard Benson. According to the digital sheet music published by Kobalt Music Publishing, the song was originally composed in the key of F major and set in common time to an energetic tempo of 130 BPM. Orianthi's vocals span approximately one-and-a-half octaves, from F₃ through C₅.

The song opens on a soft keyboard riff, which is quickly accompanied by "chugging" power chords on guitar. Orianthi's vocal style on the song has been described as "lively" and has been compared favourably to that of American pop artist Kelly Clarkson. The climax of the song is punctuated by a metal guitar solo reminiscent of 1980s pop rock music. Lyrically, "According to You" finds the narrator explaining to an ex-lover all of the differences between him and her new lover, with its hook summarizing that the new man in her life loves her for "everything I'm not, according to you."

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