No. 1 (BoA song)

"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.

Musically, "No. 1" is a dance song that infuses elements of europop. It was met with commercial success following its release; the CD single peaked at number three on the Japanese Oricon Singles Chart and was certified gold by the Recording Industry Association of Japan (RIAJ). In South Korea, "No. 1" won several awards, including the Most Popular Music Video daesang at the 2002 Mnet Music Video Festival and the Grand Prize at the annual SBS Gayo Daejeon. In 2021, a panel of 35 music experts and critics organized by Seoul Shinmun and Melon deemed it the greatest K-pop song of all time.