As One (애즈원) is a Korean pop duo consisting of Korean-Americans Lee Min-young (Min) and Chae Da-hee (Crystal).

Their first hit was the song "너만은 모르길," released in 1999 by Rock Records. Between their fourth and fifth albums, their contract with Rock Records expired and they signed with EMI Music Publishing Korea; a label which also manages other K-pop stars like DJ DOC and Baby V.O.X.. In late 2006, As One released their fifth album 12 Tears of Farewell, and started their promotional activities with the lead track "십이야" (12 Nights).