Rudnik was formerly part of the German Empire. In the German Empire, the place was called Rudorf.
The place is now called Rudnik (Grudziądz-Rudnik) and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Rudnick | German Empire | Graudenz | before the Versailles Treaty |
| Rudnik | Poland | Grudziądz | after the Versailles Treaty |
| Rudorf | German Empire | Graudenz | 1939 |
| Rudnik (Grudziądz-Rudnik) | Poland | Grudziądz m. | 1945 |
| Rudnik (Grudziądz-Rudnik) | Poland | Toruń | 1992 |