Masatsugu Kawachi (川内 将嗣, Kawachi Masatsugu, born November 25, 1985 in Kashima, Saga[3]) is a Japanese boxer best known for winning bronze at the 2007 world championships at light welterweight.

At the 2007 World Amateur Boxing Championships he sensationally upset Olympic champion Manus Boonjumnong in the first round before being manhandled by eventual winner Serik Sapiyev.

At the World Championships 2009 he lost his first bout against unsung Egidijus Kavaliauskas.

Kawachi then took the bronze medal in the 2009 Asian Amateur Boxing Championships in Zhuhai, China.

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