Niemi is a surname originating in Finland (in Finnish, it means "peninsula"). It may also refer to, alphabetically:
Antti Niemi (footballer) (born 1972), Finnish football goalkeeper
Antti Niemi (ice hockey) (born 1983), Finnish ice hockey goaltender
Antti-Jussi Niemi (born 1977), Finnish ice hockey defenceman
Erkki Niemi (born 1962), Finnish high jumper
Esko Niemi (born 1934), Finnish ice hockey player
Jari Niemi (born 1977), Finnish footballer
Kai Niemi (born 1955), motorcycle speedway rider
Laurie Niemi (1925–1968), American footballer
Lisa Niemi (born 1956), Finnish-American actress and dancer
Masa Niemi (1914–1960), Finnish actor
Matti Niemi (rower) (born 1937), Finnish rower
Matti Niemi (athlete) (born 1976), Finnish hurdler
Mikael Niemi (born 1959), Swedish author
Mikko Niemi (basketball) (born 1985), Finnish basketball player
Mikko Niemi (ice hockey) (born 1972), Finnish ice hockey player
Pekka Niemi (skier) (1909–1993), Finnish cross-country skier
Pekka Niemi (weightlifter) (born 1952), Finnish weightlifter
Shane Niemi (born 1978), Canadian sprints athlete
Virpi Niemi (born 1966), Finnish cross country skier
