Osiek was formerly part of the German Empire. In the German Empire, the place was called Karlstal (Oberschl.).
The place is now called Osiek and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Oschiek | German Empire | Groß Strehlitz | 1936 |
| Karlstal (Oberschl.) | German Empire | Groß Strehlitz | 1939 |
| Osiek | Under Polish administration | Strzelce Opolskie | 1945 |
| Osiek | Poland | Opole | 1992 |