Gnas is a municipality in the district of Südoststeiermark, in the Austrian state of Styria. It lies in the southeastern part of the country, within the broader region of Styria known for its rolling hills, vineyards, and rural landscape.
As a municipality, Gnas serves as a local administrative centre for the surrounding area, encompassing the town itself along with a number of smaller settlements and villages. Its position in the Südoststeiermark district places it in one of Austria's warmer, agriculturally productive regions.