Giełczynek [ɡʲɛu̯ˈt͡ʂɨnɛk] is a village in the administrative district of Gmina Strzegowo, within Mława County, Masovian Voivodeship, in east-central Poland. It lies approximately 26 kilometres (16 mi) south-west of Mława and 94 km (58 mi) north-west of Warsaw.