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 , North Korean defector and author on Zainichi heritage , Japanese physician, general and businessman , Japanese swimmer and businessman , Japanese professional golfer , Japanese American justice of the Supreme Court of Hawaii , Japanese politician , Japanese volleyball player , Japanese baseball player , Japanese educator, journalist, and swimming coach , Japanese karateka , Japanese long jumper