Wallerstein is a municipality and former principality in the district of Donau-Ries in Bavaria in Germany.

It was first mentioned in 1238 as Steinheim.

For generations ruled by the House of Oettingen-Wallerstein, in 1806 Wallerstein became part of the Kingdom of Bavaria by the process of mediatisation.

The family still owns the Wallerstein Castle and its surrounding land.

This Donau-Ries location article is a stub.