Henry III, Duke of Brunswick-Grubenhagen
| Henry III, Duke of Brunswick-Grubenhagen | |
|---|---|
| Born | 1416 | 
| Died | 1464 | 
| Spouse | Margaret of Sagan | 
| Issue | Henry IV | 
| House | House of Guelph | 
| Father | Eric I, Duke of Brunswick-Grubenhagen | 
| Mother | Elisabeth of Brunswick-Göttingen | 
Henry III, Duke of Brunswick-Lüneburg (* 1416 Grubenhagen, † 20 December 1464), of the House of Welf, was a Duke of Brunswick-Lüneburg ruling the ducal Principality of Grubenhagen between 1427 and 1464.