Bielefeldt is a 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

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