Yoko Koikawa (肥川 葉子, Koikawa Yōko) (born May 18, 1974, in Fukuoka, Japan) is a retired Japanese backstroke swimmer, who represented her native country at the 1992 Summer Olympics in Barcelona, Spain.

She is best known for winning the gold medal in the Women's 200m Backstroke event at the 1995 Summer Universiade in her hometown Fukuoka.

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