Grodnica [ɡrɔdˈnit͡sa] is a village in the administrative district of Gmina Olszyna, within Lubań County, Lower Silesian Voivodeship, in south-western Poland.
It lies approximately 5 kilometres (3 mi) west of Olszyna, 8 kilometres (5 mi) south of Lubań, and 121 kilometres (75 mi) west of the regional capital Wrocław.