Hartowiec [xarˈtɔvjɛt͡s] is a village in the administrative district of Gmina Rybno, within Działdowo County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 6 kilometres (4 mi) west of Rybno, 29 km (18 mi) north-west of Działdowo, and 61 km (38 mi) south-west of the regional capital Olsztyn.