Zajączków [zaˈjɔnt͡ʂkuf] is a village in the administrative district of Gmina Chotcza, within Lipsko County, Masovian Voivodeship, in east-central Poland. It lies approximately 9 kilometres (6 mi) west of Chotcza, 11 km (7 mi) north of Lipsko, and 118 km (73 mi) south-east of Warsaw.