Osek was formerly part of the German Empire. In the German Empire, the place was called Osseneck.
The place is now called Osek and belongs to Slovenia.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Osseg | Austro-Hungary | Marburg/Maribor | before the Treaty of Saint-Germain |
| Osek | Austro-Hungary | Marburg/Maribor | before the Treaty of Saint-Germain |
| Osek | Yugoslavia | Maribor levi breg | after the Treaty of Saint-Germain |
| Osseneck | German Empire | Pettau | 1941 |
| Osek | Yugoslavia | Maribor | 1945 |
| Osek | Yugoslavia | Socialistična rep. Slovenija | 1992 |
| Osek | Slovenia | Slowenien | 1991 |