Masamori (written: 正盛, 正納, 政盛, 昌盛 or 昌守) is a masculine Japanese given name. Notable people with the name include:
(1827–1885), Japanese daimyō (1606–1651), Japanese daimyō (1791–1820), Japanese daimyō (born 1974), Zainichi Korean boxer (1534–1582), Japanese samurai (died 1513), Japanese samurai (1585–1648), Japanese samurai and daimyō