Retno was formerly part of the German Empire. In the German Empire, the place was called Sorge.
The place is now called Retno and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Sorge | German Empire | Crossen (Oder) | 1939 |
| Retno | Under Polish administration | Krosno Odrzańskie | 1945 |
| Retno | Poland | Zielona Góra | 1992 |