Yuka Onishi or Ohnishi (????, Onishi Yuka, born July 6, 1968 in Toyonaka-shi, Osaka préfecture, Japan) is a Japanese actress and idol singer in the 1980s, notable in the west for her role in the TV series Sukeban Deka III in 1987 and its following movies, Sukeban Deka: The Movie and Sukeban Deka II.