No. 1 is the second Korean-language studio album by South Korean recording artist BoA. The album's composition and arrangement was handled by several music collaborators, such as Yoo Young-jin, Kangta, Ahn Ik-soo, Sigurd Heimdal Rosnes, among others. Released through SM Entertainment on April 12, 2002, No. 1 marked BoA's return to South Korea following the release of her debut Japanese album Listen to My Heart a few months prior, which saw widespread recognition in Japan.

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".