Niemczyk is a Polish surname, a diminutive of "niemiec", "German person". It can be transliterated as Nemchik. Notable people with the surname include:
Aldona Niemczyk (born 1969), German politician Andrzej Niemczyk (1944–2016), Polish volleyball coach Barbara Niemczyk (born 1942), Polish volleyball player Carolin Niemczyk (born 1990), German singer Jakub Niemczyk (born 2004), Polish footballer Julian Niemczyk (1920–2009), American diplomat Leon Niemczyk (1923–2006), Polish actor
George Nemchik (1915–1988), American soccer player
See also Niemczyk, Kuyavian-Pomeranian Voivodeship, a village in north-central Poland