Grabnik [ˈɡrabnik] is a village in the administrative district of Gmina Jaktorów, within Grodzisk Mazowiecki County, Masovian Voivodeship, in east-central Poland. It lies approximately 4 kilometres (2 mi) north-east of Jaktorów, 6 km (4 mi) west of Grodzisk Mazowiecki, and 34 km (21 mi) west of Warsaw.