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.
Apart from the town of Lubsko, Gmina Lubsko contains the villages and settlements of Białków, Chełm Żarski, Chocicz, Chocimek, Dąbrowa, Dłużek, Dłużek-Kolonia, Gareja, Górzyn, Gozdno, Grabków, Janowice, Kałek, Lutol, Małowice, Mierków, Mokra, Nowiniec, Osiek, Raszyn, Stara Woda, Tarnów, Tuchola Duża, Tuchola Mała, Tuchola Żarska, Tymienice and Ziębikowo.
Gmina Lubsko is bordered by the gminas of Bobrowice, Brody, Gubin, Jasień, Nowogród Bobrzański and Tuplice.