 | This article relies largely or entirely on a single source. (July 2022) |
| Eric I, Duke of Brunswick-Grubenhagen | |
|---|---|
| Born | c. 1383 |
| Died | 28 May 1427 |
| Spouse | Elisabeth of Brunswick-Göttingen |
| Issue | Agnes Anna Henry III Ernest II Albert II Elisabeth |
| House | House of Guelph |
| Father | Albert I, Duke of Brunswick-Grubenhagen |
| Mother | Agnes I of Brunswick-Lüneburg |
Eric I, Duke of Brunswick-Grubenhagen nicknamed the winner (German: Erich I., Herzog von Braunschweig-Grubenhagen; c. 1383 – 28 May 1427), ruled the Principality of Grubenhagen, a part of the Duchy of Brunswick-Lüneburg.