Marcel Louis Vonk (born 14 January 1974) is a poker player and the first Dutch person to win a World Series of Poker (WSOP) bracelet in No Limit Hold'em (NLHE). On 5 July 2010, he beat out 3,843 opponents to capture the gold bracelet in event #54: $1,000 No-Limit Hold'em, taking home $570,960 USD for the victory. He has live tournament winnings exceeding $1,100,000.
Marcel Vonk has a Ph.D. in physics from University of Amsterdam, and works as a researcher in string theory at the University of Amsterdam. In 2010 he authored a book on string theory in Dutch.