Schardenberg is a municipality in the district of Schärding, in the Austrian state of Upper Austria. It lies in the country's northern Alpine foreland region, close to the border with Germany and the river Inn.
The surrounding district of Schärding is part of the Innviertel, a historic region of Upper Austria. Schardenberg is one of the municipalities that make up this district, which is centred on the town of Schärding.