"Colors" (stylized as COLORS) is Hikaru Utada's 12th Japanese-language single (14th overall), and is the only single she released in 2003. It was released on January 29, 2003 and debuted at #1 on the Oricon charts with 437,903 copies sold in the first week, and became her fifth single to perform the rare two-consecutive weeks at the #1 slot feat. Two versions were released, CD and DVD.

Included as CD-Extras on this single was a multimedia section containing 13 exclusive screensavers and 13 exclusive wallpapers. A special feature on the "Colors" DVD Single is the Kanzou-sensei Report, which is a mini-documentary showing the production that went into the DVD, as well as behind-the-scenes shots of Utada working. This single reached #1 on Oricon charts and charted for 45 weeks, her longest charting single ever. Though Kazuaki Kiriya was behind the art direction for the single, he did not take an active part as usual, with the single photography going to Kaoru Izima and the PV directing going to Donald Cameron. On the cover and the inside covers, there are drawings done by Utada herself (some designs include musical notation, the word 'yes' and a drawing of the Vatican). This single became the #3 single of 2003 in Japan. "Colors" had an extremely long performance season, which included 11 performances spanning over two months (except for the last performance, which was a special). This single reached #27 on World Charts for single airplay, and reached #6 for sales. The most recent figures (May 25, 2006) show that the single sold 893,790 units in total.The song featured heavy ethereal and experimental tones for the first time in Utada's discography. It became her longest charting single ever with a 45 week trajectory on the Oricon Singles chart, selling 881,000 copies, and was #3 on the Yearly Singles chart.

"Colors" was performed during Utada's two date concert series Wild Life in December 2010.