Masamitsu (written: 正光, 正満, 成光, 政光, 将光 or 雅光) is a masculine Japanese given name. Notable people with the name include:
Masamitsu Hirano (平野 将光, born 1983), Japanese baseball player
Hoshina Masamitsu (保科 正光, 1561–1631), Japanese daimyō
Masamitsu Ichiguchi (市口 政光, born 1940), Japanese sport wrestler
Masamitsu Kanemoto (兼本 正光, born 1962), Japanese footballer
Masamitsu Kobayashi (小林 成光, born 1978), Japanese footballer
Masamitsu Naito (内藤 正光, born 1964), Japanese politician
Masamitsu Oishi (大石 正光, born 1945), Japanese politician
Masamitsu Ōshima (大島 正満, 1884–1965), Japanese scientist
Masamitsu Ota (太田 雅光, 1892–1975), Japanese printmaker
Masamitsu Tsuchida (土田 正光, born 1944), Japanese Go player
