Izak (Ieke) Moerdijk (Dutch: [ˈikə ˈmurdɛik]; born 23 January 1958) is a Dutch mathematician who in 2012 won the prestigious Spinoza prize.Moerdijk obtained his PhD at the University of Amsterdam in 1985. From 1988 to 2011 he was professor at Utrecht University. Since then he has been professor of Mathematics at the Mathematisch Instituut of the Radboud University Nijmegen.