Brzeg County (Polish: powiat brzeski [ˈpɔvʲat ˈbʐɛskʲi]) is a unit of territorial administration and local government (powiat) in Opole Voivodeship, south-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 Brzeg, which lies 39 kilometres (24 mi) north-west of the regional capital Opole.

The county also contains the towns of Grodków, lying 22 km (14 mi) south of Brzeg, and Lewin Brzeski, 17 km (11 mi) south-east of Brzeg.

The county covers an area of 876.52 square kilometres (338.4 sq mi).