Osiek was formerly part of the German Empire. In the German Empire, the place was called Osiek.
The place is now called Osiek and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Osiek | Austro-Hungary | Biala/Biała | before the Treaty of Saint-Germain |
| Osiek | Poland | Biała | after the Treaty of Saint-Germain |
| Osiek | German Empire | Bielitz | 1939 |
| Osiek | Poland | Oświęcim | 1945 |
| Osiek | Poland | Bielsko | 1992 |