Ilseng is a village in Innlandet county, Norway. The village is located mostly in Stange Municipality, however, part of the village extends across the border into Hamar Municipality. The Rørosbanen railway line passes through the village, stopping at the Ilseng Station which is the first stop after Hamar Station in Hamar. Ilseng is also the site of Ilseng Prison. The 1.06 km2 village has a population (2021) of 992 and a population density of 932 PD/km2. The village does include land in two neighboring municipalities with 0.98 km2 and 964 residents in Stange and 0.08 km2 and 28 residents in Hamar.