Klášterec was formerly part of the German Empire. In the German Empire, the place was called Klösterle.
The place is now called Klášterec and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Klösterle | Austro-Hungary | Prachatitz | before the Treaty of Saint-Germain |
| Klášterec | Austro-Hungary | Prachatitz | before the Treaty of Saint-Germain |
| Klášterec | Czechoslovakia | Prachatice | after the Treaty of Saint-Germain |
| Klösterle | Czechoslovakia | Prachatice | after the Treaty of Saint-Germain |
| Klösterle | German Empire | Prachatitz | 1938 |
| Klášterec | Czechoslovakia | Vimperk | 1945 |
| Klášterec | Czechoslovakia | Prachatice | 1992 |
| Klášterec | Czech Republic | Prachatice | 1993 |