Lipniak [ˈlipɲak] is a village in the administrative district of Gmina Wiśniew, within Siedlce County, Masovian Voivodeship, in east-central Poland. It lies approximately 7 kilometres (4 mi) west of Wiśniew, 11 km (7 mi) south-west of Siedlce, and 84 km (52 mi) east of Warsaw.