"Number One" is a song by American musician Pharrell Williams featuring American rapper Kanye West, released by Star Trak Entertainment and Virgin Records on August 21, 2006 as the third single from Williams' debut studio album, In My Mind (2006). A synth-heavy love song, it was written by both performers and produced by the former.
"Number One" became the second song from In My Mind to enter the Billboard Hot 100, where it peaked at number 57. The song was praised by critics, in contrast from its parent album.