Kyoko Iwasaki (岩崎 恭子, Iwasaki Kyōko?, married name: Kyoko Saito (斎藤恭子), born July 21, 1978 in Numazu, Shizuoka, Japan) is a retired swimmer from Japan. She won the gold medal in the 200 metres breaststroke at the 1992 Summer Olympics in Barcelona, Spain. She was at age of 14 years and 6 days when she got the medal.