Ostermiething is a municipality in the district of Braunau am Inn, in the Austrian state of Upper Austria. It lies in the northwestern part of the country, within the Innviertel region bordering Germany, and forms part of the district that takes its name from the town of Braunau am Inn.
As a municipality, Ostermiething is one of the local administrative units that make up the Braunau am Inn district, alongside towns and villages of varying size. Upper Austria is one of Austria's nine federal states, and its municipalities serve as the lowest tier of local government, handling local affairs for their resident communities.
The surrounding area is part of Austria's Alpine foreland, a landscape of rolling terrain and farmland characteristic of the Innviertel. Further details about the municipality's history, population, and landmarks are limited in the available source material.