Miłostajki [miwɔsˈtai̯ki] is a village in the administrative district of Gmina Lidzbark, within Działdowo County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 7 kilometres (4 mi) east of Lidzbark, 18 km (11 mi) west of Działdowo, and 71 km (44 mi) south-west of the regional capital Olsztyn.