Dobry Lasek [ˈdɔbrɨ ˈlasɛk] is a village in the administrative district of Gmina Piecki, within Mrągowo County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 5 kilometres (3 mi) south-east of Piecki, 17 km (11 mi) south-east of Mrągowo, and 60 km (37 mi) east of the regional capital Olsztyn.