1. Germany: This is the largest and most obvious German-speaking country.
2. Austria: Austrian German is a distinct dialect, but still very mutually intelligible with standard German.
3. Switzerland: Swiss German is a collection of dialects spoken in different cantons. While it can be difficult for German speakers to understand, Standard German is also an official language of the country.
4. Liechtenstein: German is the official language of this small principality.
There are other countries and regions in Europe where German is spoken, including:
* Belgium: A small German-speaking community exists in the eastern part of the country.
* Italy: The South Tyrol region in northern Italy has a significant German-speaking population.
* Luxembourg: German is one of the three official languages (along with Luxembourgish and French).
Let me know if you'd like to know more about any of these countries or their languages!