"Only One" is a song recorded by South Korean singer-songwriter BoA for her 2012 album of the same name. Written and composed by BoA herself with additional arrangement by Kim Yong-shin and Kim Tae-seong, the pop and R&B track was released as the second single from Only One on July 22, 2012, to coincide with its parental album release. It was re-recorded in Japanese and released as her 32nd Japanese single under Avex Trax on February 27, 2013. It was later included on the track list of her eighth Japanese studio album Who's Back? (2014).

Kwon Bo-ah, known professionally as BoA, is a South Korean singer, songwriter, dancer, producer and actress. She is often referred to as the "Queen of K-pop".