Łomnica [wɔmˈnit͡sa] is a village in the administrative district of Gmina Wodynie, within Siedlce County, Masovian Voivodeship, in east-central Poland. It lies approximately 4 kilometres (2 mi) south-west of Wodynie, 29 km (18 mi) south-west of Siedlce, and 67 km (42 mi) east of Warsaw.