Mayuko Hagiwara (萩原麻由子, Hagiwara Mayuko, born 16 October 1986, in Maebashi, Gunma, Japan) is a Japanese women's racing cyclist who currently rides for Wiggle Honda. After graduating from the National Institute of Fitness and Sports in Kanoya she joined the cycling team sponsored by the Japanese bicycle store Cycle Base Asahi. She won the national road race championship three years in a row between 2010 and 2012 and the time trial championship five times in a row between 2008 and 2012.