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