Osowiec was formerly part of the German Empire. In the German Empire, the place was called Osowiec.
The place is now called Osowiec and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Osowiec | Russian Empire | Turek | 1914 |
| Osowiec | Poland | Turek | 1921 |
| Osowiec | German Empire | Turek | 1939 |
| Osowiec | Poland | Poddębice | 1945 |
| Osowiec | Poland | Sieradz | 1992 |