Kazumasa Tsujimoto

 (born January 6, 1975 in Nara) is a retired male boxer from Japan. He represented his native country twice at the Summer Olympics: in 1996 and 2000. After having competed in the men's flyweight division (– 51 kg) in Atlanta, Georgia he changed weights, and fought in the bantamweight class (– 54 kg) in Sydney, Australia. There he was stopped in the second round by Cuba's eventual gold medalist Guillermo Rigondeaux.