"Back at One" is a song written and performed by American recording artist Brian McKnight, taken from his fifth studio album of the same name. The album was released in 1999.

The music video was directed by Francis Lawrence and was nominated for R&B video of the year in the Music Video Production Association Awards.

"Back at One" went on to be one of McKnight's biggest successes, reaching in to the top ten in New Zealand, Canada, and the US, where it eventually peaked at number 2 for eight weeks behind "Smooth" by Santana.

Mark Wills, a country music singer, covered "Back at One" on his 1999 album Permanently, also releasing it as that album's first single. Released two months after McKnight's version, Wills' cover peaked at #2 on the Billboard country singles charts for a week behind 'My Best Friend' by Tim McGraw. Despite not reaching the top spot in the US, the song did manage to reach number one on the Canadian RPM country tracks. In addition to his country chart success, Back at One also became his fifth entry on the Hot 100 charts, peaking at #36 there.

The music video was directed by Jim Hershleder.

McKnight also performed the song with Brazilian singer Ivete Sangalo on her album Festa (en: Party).

In 2000, keyboardist Bob Baldwin released a cover of the song from the album "BobBaldwin.com." Also in 2000, Jamaican reggae and dancehall singer Sanchez recorded a reggae cover version of the song over the 'Fi Wi Rock' rhythm produced by King Jammy which became a popular dancehall hit in Jamaica and the U.S. Irish boyband Westlife duetted with Lulu in 2002.

Another instrumental rendition of this song has been performed by saxophonist Warren Hill, from his album 2005 PopJazz.

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