Dennis de Vreugt is a Dutch chess grandmaster born on 6 January 1973 in the Netherlands. He earned his Grandmaster title in 1998. He was awarded the FIDE title of International Master in 1997.
De Vreugt was a participant in the 34th Chess Olympiad held in Istanbul in 2000 where he represented the Netherlands. He also participated in numerous European Team Chess Championships.
One significant event in his career was his victory over Alexander Morozevich in 1998, who was considered one of the top chess players in the world at that time.