- For the Hong Kong girl group of the same name, see As One (group).
As One (애즈원) is a female R&B duo under Brand New Music. They debuted in November 1999 with the album Day By Day.
On May 31, 2017, Brand New Music announced the duo would be ending their music promotions for the time being to focus on their personal lives. Their last single, "Goodbye for Now", was released on June 5, 2017. They returned on December 15, 2019 with the special single "It's Ok To Not Be Ok" to commemorate their 20th anniversary.