Pijawnia [piˈjavɲa] is a village in the administrative district of Gmina Siemiątkowo, within Żuromin County, Masovian Voivodeship, in east-central Poland. It lies approximately 4 kilometres (2 mi) south of Siemiątkowo, 26 km (16 mi) south of Żuromin, and 97 km (60 mi) north-west of Warsaw.