Mayumi Watanabe (?? ??, Watanabe Mayumi, born 6 June 1983 in Niigata Prefecture) is a Japanese athlete who specialises in sprinting events.
She represented her country at the 2007 and 2009 World Championships.
Her personal bests are 11.44 seconds in the 100 metres (+1.7 m/s, Fukushima 2011) and 23.35 seconds in the 200 metres (+0.4 m/s, Fukuroi 2013).