Osetno was formerly part of the German Empire. In the German Empire, the place was called Mossetten.
The place is now called Osetno and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Ossettno | German Empire | Löbau | before the Versailles Treaty |
| Osetno | Poland | Lubawa | after the Versailles Treaty |
| Mossetten | German Empire | Neumark (Westpr.) | 1939 |
| Osetno | Poland | Nowe Miasto Lubawskie | 1945 |
| Osetno | Poland | Toruń | 1992 |