Ostrowo was formerly part of the German Empire. In the German Empire, the place was called Tetzlaff.
The place is now called Ostrowo and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Ostrowo b. Gostyn | German Empire | Gostyn | before the Versailles Treaty |
| Ostrowo | Poland | Gostyń | after the Versailles Treaty |
| Tetzlaff | German Empire | Gostingen | 1939 |
| Ostrowo | Poland | Gostyń | 1945 |
| Ostrowo | Poland | Leszno | 1992 |