Wielgorz [ˈvjɛlɡɔʂ] is a village in the administrative district of Gmina Mordy, within Siedlce County, Masovian Voivodeship, in east-central Poland. It lies approximately 5 kilometres (3 mi) south-west of Mordy, 15 km (9 mi) east of Siedlce, and 102 km (63 mi) east of Warsaw.