"Boys & Girls" is a song recorded by Japanese recording artist Ayumi Hamasaki, serving as the fourth single for her second studio album, Loveppears (1999). It was released by Avex Trax in Japan and Hong Kong on July 14, 1999, and through Avex USA in North America in early 2001, while being re-distributed in 2003. "Boys & Girls" marks Hamasaki's first single to be made available for purchase as a maxi single with additional remixes. The track was written by the singer herself, while production was handled by long-time collaborator Max Matsuura. Musically, the song is a dance recording, a genre that heavily influences Loveppears. The single's lyrical content is written in third-person perspective.

Upon its release, "Boys & Girls" received positive reviews from music critics, with some praising the original version of the song, but also acclaiming the different selection of remixes on its physical release. Commercially, the single experienced success in Japan, being subjected to a controversial competition with the song "Be Together" by Japanese recording artist Ami Suzuki, who eventually outperformed "Boys & Girls" during its first charting week on the Oricon Singles Chart. It became Hamasaki's first single to sell over one million copies, and was certified double Platinum by the Recording Industry Association of Japan (RIAJ) for shipments of 800,000 units.

An accompanying music video was directed by Wataru Takeishi, and featured Hamasaki in an orange-lit room circulated by mysterious light and furniture. In order to promote the single, it appeared on several remix and greatest hits compilation albums and live concert torus conducted by Hamasaki. "Boys & Girls" was additionally used as the theme song for the cosmetics company Aube, which led to the singer becoming their spokeswoman. To date, the recording is one of the best-selling singles in Japanese music history and remains one of her highest-selling tracks.

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