Bielefeldt is a low German surname.
Notable people with the surname include:
:de:Alwin Bielefeldt (1857–1942), pioneer of Allotment (gardening) Dirk Bielefeldt (born 1957), German actor and cabaret artist Heiner Bielefeldt (born 1958), German theologian, philosopher and historian Viggo Bielefeldt (1851–1909), Danish composer