Olszowa was formerly part of the German Empire. In the German Empire, the place was called Erlenhöh.
The place is now called Olszowa and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Olszowa | German Empire | Kempen i. Posen | before the Versailles Treaty |
| Olszowa | Poland | Kępno | after the Versailles Treaty |
| Olschowa | German Empire | Kempen (Wartheland) | 1939 |
| Erlenbrunn | German Empire | Kempen (Wartheland) | 1939 |
| Erlenhöh | German Empire | Kempen (Wartheland) | 1939 |
| Olszowa | Poland | Kępno | 1945 |
| Olszowa | Poland | Kalisz | 1992 |