Roel Koolen (born April 20, 1982 in Mierlo) is a Dutch baseball player who currently plays for Kinheim and the Dutch national team.Koolen made his Hoofdklasse debut at the Twins Sporting Club in 1998. He played for the Dutch junior team in the 1999 World Junior Championship and 2000 World Junior Championship. In 2000, Koolen moved to DOOR Neptunus and helped the team win the Holland Series in 2001, 2002, 2004 and 2005 (he was not on the team in 2003). In the 2004 playoffs, he was named MVP.