Mashu Baker or Matthew Baker (ベイカー 茉秋, Beikā Mashū, born 25 September 1994 in Tokyo), is a male Japanese judoka.
His father is an American. His parents divorced when he was little and was raised by his mother.
He started judo at the age of 7. His favorite technique is Ouchi Gari. In 2015, he won the bronze medal in the Middleweight (90 kg) division at the 2015 World Judo Championships. He is currently ranked No. 38 in the world (as of 2019). He won the gold medal in under 90 kg division in 2016 Rio Olympics.