Gmina Lubsko is an urban-rural gmina (administrative district) in Żary County, Lubusz Voivodeship, in western Poland. Its seat is the town of Lubsko, which lies approximately 21 kilometres (13 mi) north-west of Żary and 41 km (25 mi) south-west of Zielona Góra.
The gmina covers an area of 182.69 square kilometres (70.5 sq mi), and as of 2019 its total population is 18,452.