Marianne Antoinette van Geenhuizen is a Dutch field hockey player who played as an attacker for Dutch clubs Oranje Zwart, HC Den Bosch and Laren. Currently she is playing for Amsterdam. Van Geenhuizen also plays for the Netherlands national team. She was a member of the Dutch squad that won the silver medal at the 2004 Summer Olympics in Athens. She was also part of the Dutch squad that became World Champion at the 2006 Women's Hockey World Cup. At the 2008 Summer Olympics in Beijing she won an olympic gold medal with the Dutch national team beating China in the final 2-0. 

December 17th, 1981 in Eindhoven (Age 42)