Denderleeuw is a municipality located in the Belgian province of East Flanders in the Denderstreek. The municipality comprises the towns of Denderleeuw proper, Iddergem and Welle. On January 1, 2006 Denderleeuw had a total population of 17,357. The total area is 13.77 km² which gives a population density of 1260 inhabitants per km². The current mayor of Denderleeuw is Jo Fonck, from the SP-A (Social-Democratic) party.