Gmina Lewin Brzeski is an urban-rural gmina (administrative district) in Brzeg County, Opole Voivodeship, in south-western Poland. Its seat is the town of Lewin Brzeski, which lies approximately 17 kilometres (11 mi) south-east of Brzeg and 25 km (16 mi) north-west of the regional capital Opole.
The gmina covers an area of 159.7 square kilometres (61.7 sq mi), and as of 2019 its total population is 12,968.