Giednia [ˈɡʲɛdɲa] is a village in the administrative district of Gmina Szydłowo, within Mława County, Masovian Voivodeship, in east-central Poland. It lies approximately 3 kilometres (2 mi) south-east of Szydłowo, 9 km (6 mi) south-east of Mława, and 101 km (63 mi) north of Warsaw.