Niemi is a Finnish surname of Laine type literally meaning "peninsula".

• 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 (1934–2013), 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 (rowing) (born 1937), Finnish coxswain
• 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
• Pentti Niemi, (1902–1962), Finnish Lutheran clergyman and politician
• Reino Niemi, (1914–1966), Finnish chess player
• Robert Niemi (1955–2022), American literary scholar, literary critic and author
• Shane Niemi (born 1978), Canadian sprints athlete
• Veijo Niemi, Finnish politician
• Virpi Niemi (born 1966), Finnish cross country skier

• All pages with titles containing Niemi