Yasumasa is a masculine Japanese given name. Notable people with the name include:
Fukushima Yasumasa (1852–1919), general in the Imperial Japanese Army
Sakakibara Yasumasa (1548–1606), Japanese daimyo of the late Sengoku period through early Edo period
Yasumasa Hane (born 1944), professional Go player
Yasumasa Kanada (born 1949), Japanese mathematician
Yasumasa Morimura (born 1951), Japanese appropriation artist
Yasumasa Nishino (born 1982), Japanese football player
Yasumasa Shigeno, Japanese politician and member of the House of Representatives