Rudolfus ("Ruud"😉 Hubertus Janssen (born 28 September 1986) is a Dutch chess Grandmaster (2009) and an aspiring chess coach.
Janssen was born in Venray, Netherlands. He received his International Master title in 2006 and his Grandmaster title in 2009. He has participated in several chess tournaments, both nationally and internationally. Notable achievements include winning the Science Park Amsterdam Chess Tournament in July 2019, and the Dutch Rapid Chess Championship in December 2019. He has also participated in the Chess Olympiads as a part of the Dutch team in 2008 and 2010.