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 playerHoshina Masamitsu (保科 正光, 1561–1631), Japanese daimyōMasamitsu Ichiguchi (市口 政光, born 1940), Japanese sport wrestlerMasamitsu Kanemoto (兼本 正光, born 1962), Japanese footballerMasamitsu Kobayashi (小林 成光, born 1978), Japanese footballerMasamitsu Naito (内藤 正光, born 1964), Japanese politicianMasamitsu Oishi (大石 正光, born 1945), Japanese politicianMasamitsu Ōshima (大島 正満, 1884–1965), Japanese scientistMasamitsu Ota (太田 雅光, 1892–1975), Japanese printmakerMasamitsu Tsuchida (土田 正光, born 1944), Japanese Go player