Osiek was formerly part of the German Empire. In the German Empire, the place was called Lichting.
The place is now called Osiek and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Oschek | German Empire | Namslau | 1935 |
| Lichting | German Empire | Namslau | 1939 |
| Osiek | Under Polish administration | Namysłów | 1945 |
| Osiek | Poland | Opole | 1992 |