Ryżyn was formerly part of the German Empire. In the German Empire, the place was called Ritzmühle.
The place is now called Ryżyn and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Ryzin | German Empire | Birnbaum | before the Versailles Treaty |
| Ryżyn | Poland | Międzychód | after the Versailles Treaty |
| Ryzin | German Empire | Birnbaum (Wartheland) | 1939 |
| Mühldorf | German Empire | Birnbaum (Wartheland) | 1939 |
| Ritzmühle | German Empire | Birnbaum (Wartheland) | 1939 |
| Ryżyn | Poland | Międzychód | 1945 |
| Ryżyn | Poland | Poznań | 1992 |