Sayaka Matsumoto (サヤカ・松本, Matsumoto Sayaka?) (born December 5, 1982) is a Japanese-born American judoka. Matsumoto competed for the United States in the women's 48 kg judo event at the 2008 Summer Olympics.
Matsumoto, who was raised in California, is coached by her father, David Matsumoto. She began judo at the age of 5. Matsumoto won the 2004 U.S. Olympic Trials, but did not compete in the Olympics that year because the U.S. failed to earn a spot in her weight class. Matsumoto again won the U.S. Olympic Trials in 2008 and competed in the Olympic Games.
At the 2008 Summer Olympics she fought against Ryoko Tani (JPN) and Shugen Wu (CHN), but lost both matches.