Niemann is a Low German surname. Notable people with the surname include:
Albert Niemann (chemist) (1834–1861), German chemistAlbert Niemann (paediatrician) (1880–1921), German physicianAlbert Niemann (tenor) (1831–1917), German opera singerBrausch Niemann (born 1939), South African racing driverCarl Niemann (1908–1964), American biochemistEdmund John Niemann (1813–1876), British artistGunda Niemann-Stirnemann (born 1966), German speed skaterJeff Niemann (born 1983), American baseball playerJerrod Niemann (born 1979), American country music singerJohan Niemann (born 1977), Swedish bassistJohann Niemann (1913–1943), Nazi SS officerKristian Niemann (born 1971), Swedish guitaristRandy Niemann (born 1955), American baseball coach and player