Włostowice [vwɔstɔˈvit͡sɛ] (German Roßnitz; Lower Sorbian: Rožnica) is a village in the administrative district of Gmina Trzebiel, within Żary County, Lubusz Voivodeship, in western Poland, close to the German border. It lies approximately 9 kilometres (6 mi) south of Trzebiel, 23 km (14 mi) west of Żary, and 63 km (39 mi) south-west of Zielona Góra.