"Only U" is the first single from Ashanti's third studio album, Concrete Rose (2004). Released in October 2004, it reached number thirteen in the United States and number two in the United Kingdom.

Official remixes feature Cam'ron, Juelz Santana, Ja Rule, and Black Child. It has also been noted as the first opening single of any of Ashanti's previous albums that never topped any chart, particularly the Billboard Hot 100.

The song is introduced using a sample of Club Nouveau's 1986 song "Why You Treat Me So Bad".