* Germany (obviously!)
* Austria
* Switzerland (along with French, Italian, and Romansh)
* Liechtenstein
* Luxembourg (along with French)
* Belgium (along with French, Dutch, and others)
* Italy (in the autonomous region of South Tyrol)
It's also spoken by significant minorities in other countries like:
* France
* Poland
* Czech Republic
* Romania
* Hungary
* Russia (especially in the Volga German communities)
* Namibia
* United States (especially in Pennsylvania)
However, it's only officially recognized as a minority language in some of these places.