Natternbach is a municipality in the district of Grieskirchen, in the Austrian state of Upper Austria. It is located in the country's north-central region, within the Hausruckviertel area of Upper Austria.
As a municipality, Natternbach is one of the administrative units that make up the Grieskirchen district, a district in the eastern part of Upper Austria. The municipality is situated in the rolling hill country characteristic of this part of the state, between the Hausruck hills and the Danube valley.
Like many small Austrian municipalities, Natternbach functions as a local administrative and residential community for its surrounding rural area. It is one of several municipalities within the Grieskirchen district, which lies roughly midway between the cities of Linz and Passau.