Masaji (written: 政司, 政治, 政次, 正次, 雅治 or 正二) is a masculine Japanese given name. Notable people with the name include:
*, Japanese sumo wrestler
*, Japanese former professional baseball pitcher
*, Japanese ski jumper
*, Japanese physician, general and businessman
*, Japanese swimmer and businessman
*
Masaji Kusakabe (born 1946), Japanese golfer
*, Japanese politician
*, Japanese volleyball player
*, Japanese baseball player
*, Japanese karateka
*, Japanese long jumper
{{given name
Japanese masculine given names