Rei Harakami (レイ・ハラカミ) (10 December 1970 – 27 July 2011) was a Kyoto-based electronic musician from Hiroshima, Japan. He composed and mixed on two Roland SC-88Pro sound generators, at times supplemented by the Roland SK-88Pro keyboard model. He suffered a fatal brain hemorrhage on 27 July 2011.

Rei released his debut album in 1998 on Sublime Records. Follow-up albums, opa*q in 1999 and red curb in 2001 showcased his skills as an artist and producer. Rei's growing reputation resulted in his becoming in demand as a producer and collaborator for artists such as UA, Great 3 and Coldcut. His recent collaboration as an artist and producer was on Akiko Yano's 2004 album, Honto no Kimochi ("True feelings"), and resulted in widespread recognition in Japan.