"No One" is a song by American singer and songwriter Alicia Keys, taken from her third studio album, As I Am (2007). It was written and produced by Keys, Kerry Brothers, Jr., and George M. Harry, and released as the album's lead single in September 2007. This is one of Keys' biggest songs, having topped several singles charts, including the Billboard Hot 100 for five consecutive weeks and the Hot R&B/Hip-Hop Songs chart for ten consecutive weeks. It is her second solo number-one single in the United States after 2001's "Fallin'".

In 2008, "No One" was ranked at number forty-two on The Billboard Hot 100 All-Time Top Songs and number fourteen on the Top Billboard Hot 100 R&B/hip-hop songs. In 2009, the song placed at number six on the Billboard Hot 100 decade-end chart. It also placed at number 48 on Billboard's "Hot 100 55th Anniversary: The All-Time Top 100 Songs".

The song won Best Female R&B Vocal Performance and Best R&B Song at the 2008 Grammy Awards on February 10, 2008. During the ceremony, Keys performed it in a duet with John Mayer. "No One" was also the most listened song on U.S. radio of 2008 with 3.08 billion listeners. According to the International Federation of the Phonographic Industry, "No One" is the eight biggest selling single of 2008 with sales over 5.6 million.

"No One" was written and produced by Alicia Keys, Kerry Brothers, Jr., and George M. Harry. Keys told MTV News Canada that the song "is really talking about the way that in relationships, the way that so many things are around you all the time to try to distract you. And even though people may talk and say whatever they may want to say, but then no one can get in the way of this." Keys said that it was a song that "just wrote itself". It was one of the last songs written for the album.

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