Jesionowiec [jɛɕɔˈnɔvjɛt͡s] (German: Jeschonowitz) is a village in the administrative district of Gmina Wielbark, within Szczytno County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 5 kilometres (3 mi) north of Wielbark, 15 km (9 mi) south of Szczytno, and 49 km (30 mi) south-east of the regional capital Olsztyn.