Mitani is a Japanese surname. Notable people with this name include: Koichiro Mitani (born 1968), judoka Kōki Mitani (born 1961), playwright Minatsu Mitani (born 1991), badminton player Mitsuo Mitani (born 1959), politician Mitani Takanobu (1892–1985), government official Zen Mitani (born 2007), motorcycle racer