"One" (capitalized as "ONE") is a song recorded by Japanese recording artist Ami Suzuki for her seventh studio album, Supreme Show (2008). It was written and produced by Japanese producer and Capsule member Yasutaka Nakata. The track is Suzuki's third single with Nakata after her August 2007 single's "Free Free" and "Super Music Maker". "One" premiered on June 18, 2008 as the lead single from the album.

Musically, "One" was described as a dance and club song. The lyrics describes Suzuki's celebration of her career and music; it also emphasizes minor themes of love, happiness, partying, and relationships. Upon its release, the track garnered positive reviews from music critics and was praised for its composition and commercial appeal. It also achieved lukewarm success in Japan, peaking at number 17 on the Japanese Oricon Singles Chart and 47 on the Billboard Japan Hot 100 chart. As of March 2016, "One" has sold over eight thousand units in Japan alone.

The accompanying music video for "One" was shot in Tokyo; it features Suzuki inside of a club, surrounded by LED lamps and several club poles. The music video became notable for displaying another change in Suzuki's persona and is cited as an example of her numerous "reinventions". For additional promotion, the song was featured on Suzuki's One Promotional Tour, and at her 29th birthday event.

"One" was written, produced, composed and arranged by Japanese musician and Capsule member Yasutaka Nakata. Nakata was not credited as the single's featuring artist where it was first introduced on Suzuki's double a-side single "Free Free" and "Super Music Maker" (2007). It is Suzuki's third single to be handled by Nataka, following "Free Free" and "Super Music Maker". It was selected as the lead single from Supreme Show, and was released on June 18, 2008 by Avex Trax. "One" is to commemorate her 10th anniversary of her music career, and was released physically on July 2 that same year.

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