Hirotsu is a Japanese surname. Notable people with the surname include:
Eiji Hirotsu (born 1967), Japanese rugby union player Kazuo Hirotsu (1891–1968), Japanese novelist, literary critic and translator Momoko Hirotsu (1918–1988), Japanese novelist Motoko Hirotsu (born 1953), Japanese politician Ryūrō Hirotsu, also Hirotsu Ryūrō (1861–1928), Japanese novelist
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