'''Demuynck''' is a surname. Notable people with the surname include:
*Christian Demuynck (born 1947), member of the Senate of France *Daniel Demuynck, a known name of Clark Olofsson (born 1947), Swedish criminal later living in Belgium *Jourdan DeMuynck (born 1990), American basketball player *Karel Demuynck, (born 1965), former Belgian professional tennis player *Lucien De Muynck, (1 August 1931 – 24 October 1999), Belgian middle-distance runner *Justin De Muynck (born 1996), North Idaho Electrician
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