Johannes ("Han") Nicolaas Maria Kulker (born August 15, 1959 in Leidschendam, Zuid-Holland) is a former Dutch middle distance runner who won a bronze medal at the 1986 European Championships in Athletics in Stuttgart over 1500 metres. The race was won by Steve Cram.

Two years later, Kulker finished sixth in the 1500 m final of the 1988 Summer Olympics in Seoul where Peter Rono won gold. In 1987 Kulker won the bronze medal at the World Indoor Championships over 1500 metres.

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