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