Niimi (written: 新見, 新美 or 新実) is a Japanese surname. Notable people with the surname include:
(1887–1993), Imperial Japanese Navy admiral (1836–1863), a commander of the Shinsengumi (1913–1943), Japanese writer (born 1989), Japanese politician (born 1974), Japanese taekwondo practitioner (born 1964), Aum Shinrikyo member (born 1949), Japanese handball player