Masao Maruyama is the name of:
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Masao Maruyama (Japanese Army officer) (1889–1957), commander in the Imperial Japanese Army during World War II
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Masao Maruyama (scholar) (1914–1996), political theorist and historian
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Masao Maruyama (film producer) (born 1941), producer for animation company Studio Madhouse
{{hndis, Maruyama, Masao