Sugar High is the third studio album by Japanese singer-songwriter Chihiro Onitsuka, released in December 2002.

The album title was quoted from the lyrics of a song sung on the American motion picture Empire Records.

The first press of the album features bonus 8cm compact disc including another version of "Castle･Imitation" and its backing track.

Since Onitsuka cancelled the release of fourth studio album and left both the management office and record label in 2004, Sugar High became the final non-compilation album she released under the Virgin Tokyo label distributed by Toshiba EMI.

"Castle Imitation" was used as the end credits song in the video game Breath of Fire: Dragon Quarter