Sedlnice was formerly part of the German Empire. In the German Empire, the place was called Sedlnitz.
The place is now called Sedlnice and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Sedlnitz | Austro-Hungary | Neutitschein | before the Treaty of Saint-Germain |
| Sedlnice | Austro-Hungary | Neutitschein | before the Treaty of Saint-Germain |
| Sedlnice | Czechoslovakia | Nový Jičín | after the Treaty of Saint-Germain |
| Sedlnitz | Czechoslovakia | Nový Jičín | after the Treaty of Saint-Germain |
| Sedlnitz | German Empire | Neu Titschein | 1938 |
| Sedlnice | Czechoslovakia | Nový Jičín | 1945 |
| Sedlnice | Czechoslovakia | Nový Jičín | 1992 |
| Sedlnice | Czech Republic | Nový Jičín | 1993 |