Żagań County (Polish: powiat żagański) is a unit of territorial administration and local government (powiat) in Lubusz Voivodeship, western Poland.

It came into being on January 1, 1999, as a result of the Polish local government reforms passed in 1998.

Its administrative seat and largest town is Żagań, which lies 39 km (24 mi) south of Zielona Góra and 124 km (77 mi) south of Gorzów Wielkopolski.

The county covers an area of 1,131.29 square kilometres (436.8 sq mi).

The county is subdivided into nine gminas (two urban, three urban-rural and four rural).