Ossöwen was formerly part of the German Empire. In the German Empire, the place was called Ossau.
The place is now called Osowo and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Ossöwen | German Empire | Goldap | 1938 |
| Ossau | German Empire | Goldap | 1939 |
| Osowo | Under Polish administration | Gołdap | 1945 |
| Osowo | Poland | Suwałki | 1992 |