"No One" is a song by American R&B and soul singer–songwriter Alicia Keys from her third studio album, As I Am (2007). Written and produced by Keys, Kerry Brothers, Jr., and George D. Harry, and released as the album's lead single in September 2007, this is overall Keys' biggest hit to date, having topped several singles charts, including the Billboard Hot 100 for five consecutive weeks and the Hot R&B/Hip-Hop Songs for ten consecutive weeks and it was her first single to reach number one single R&B chart in the United States after 2004's "If I Ain't Got You". "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. It is her second solo number-one single in the United States after 2001's "Fallin'". In 2009 the song was named number six on the Billboard Hot 100 Songs of the Decade.
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.
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."
It was ranked at number three on the recap of The 10 Best Songs of 2007 by Entertainment Weekly, while it was voted number twenty-three in The Village Voice's 2007 Pazz & Jop critics' poll (tied with Modest Mouse's "Dashboard", R. Kelly's "I'm a Flirt" (Remix) featuring T.I. and T-Pain, and Avril Lavigne's "Girlfriend").