Olejnica was formerly part of the German Empire. In the German Empire, the place was called NN.
The place is now called Olejnica and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Oelpoche | German Empire | Bomst | before the Versailles Treaty |
| Olejnica | Poland | Wolsztyn | after the Versailles Treaty |
| NN | German Empire | Wollstein | 1939 |
| Olejnica | Poland | Wolsztyn | 1945 |
| Olejnica | Poland | Leszno | 1992 |