Kyōko Koizumi (小泉今日子, Koizumi Kyōko?) (b. February 4, 1966 in Atsugi, Kanagawa) is a Japanese singer and actress famous in Japan. Her music is released through Victor Entertainment in Japan. She is also known by the nickname Kyon Kyon. She had a solo female singer's record that her singles reached Top ten for 12 consecutive years before the record was broken by Namie Amuro. She married actor Nagase Masatoshi in 1995, and divorced in 2004. She has worked with well known anime music composer Yoko Kanno who composed the music for Koizumi's 21st album, Otoko no Ko Onna no Ko. In the 90's, she released a few dance remixes on vinyl only under the project name "Koizumix Production".
As an actress, she played in numerous dramas and movies; most notably, she was cast in two of the most successful movies in Japan ever: as the serial killer in "Bayside Shakedown aka Odoru Daisousasen: The Movie" (1998), and as the witch in "Onmyoji" (2001). In 2006 she starred as Eriko, the mother, in Toshiaki Toyoda's film Hanging Garden.