Stefan Voncken is a German coxswain.
Voncken is a member of the Ruderverein (rowing club) Neptun in Konstanz. He won gold with the coxed four at the 1969 European Rowing Championships in Klagenfurt. He won a gold medal at the 1970 World Rowing Championships in St. Catharines with the men's coxed four. After his competitive rowing career, he worked at his rowing club as a coach.
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