||October 31, 1980
Geert-Jan Marie Derikx (born October 31, 1980 in Den Bosch, Noord-Brabant) is a field hockey player from the Netherlands, who won the silver medal with the Dutch national squad at the 2004 Summer Olympics in Athens.
The defender made his debut in May 1, 2002 in a friendly match against Germany: 1-1. He plays for Stichtse Cricket en Hockey Club in the Dutch League (Hoofdklasse), after a long time spell with HC Klein Zwitserland in The Hague. His younger brother Rob is also a member of the Dutch field hockey squad. In the summer of 2007 he moved to Amsterdam.