Osieczek was formerly part of the German Empire. In the German Empire, the place was called Seeheim, Kr. Briesen (Westpr.).
The place is now called Osieczek and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Seeheim | German Empire | Briesen | before the Versailles Treaty |
| Osieczek | Poland | Wąbrzeźno | after the Versailles Treaty |
| Seeheim, Kr. Briesen (Westpr.) | German Empire | Briesen (Westpr.) | 1939 |
| Osieczek | Poland | Wąbrzeźno | 1945 |
| Osieczek | Poland | Toruń | 1992 |