Gmina Tarnów Opolski, German Gemeinde Tarnau is a rural gmina (administrative district) in Opole County, Opole Voivodeship, in south-western Poland. Its seat is the village of Tarnów Opolski (Tarnau), which lies approximately 15 kilometres (9 mi) south-east of the regional capital Opole.
The gmina covers an area of 81.6 square kilometres (31.5 sq mi), and as of 2019 its total population is 9,580. Since 2007 the commune, like much of the area, has been officially bilingual in German and Polish, a large German population having remained in the area after it was transferred to Polish control.