"No. 1" is a song by South Korean recording artist BoA. It was released on April 12, 2002, for her second studio album of the same name (2002) through SM Entertainment. In Japan, the song was released as a double A-side CD single with the track "Kiseki" on September 19, 2002, via Avex Trax. The single, titled "Kiseki / No. 1", was included in her second Japanese studio album Valenti (2003). "No. 1" was written by Kim Young-ah, while production was handled by Sigurd Røsnes and Ahn Ik-soo.

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".