Zajączkowo [zajɔnt͡ʂˈkɔvɔ] is a village in the administrative district of Gmina Grodziczno, within Nowe Miasto County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 7 kilometres (4 mi) north-west of Grodziczno, 8 km (5 mi) north-east of Nowe Miasto Lubawskie, and 66 km (41 mi) south-west of the regional capital Olsztyn.