Erpe is a sub-municipality of Erpe-Mere in Flanders, Belgium, on the Molenbeek-Ter Erpenbeek in the Denderstreek in the southeast of East Flanders and belongs to Arrondissement of Aalst. The sub-municipality is bordered by the sub-municipalities of Mere, Ottergem, and Erondegem and the municipalities Lede and Aalst. Erpe had 4903 inhabitants as of 1 January 2003 and an area of . The population density is .