John Beaufort | |
|---|---|
| 1st Duke of Somerset | |
 John Beaufort, 1st Duke of Somerset, detail from his effigy in Wimborne Minster, Dorset | |
| Earl of Somerset | |
| Predecessor | Henry Beaufort, 2nd Earl of Somerset (elder brother) |
| Successor | Edmund Beaufort, 2nd Duke of Somerset (younger brother) |
| Born | 25 March 1404 |
| Died | 27 May 1444 (aged 40) |
| Buried | Wimborne Minster church |
| Family | Beaufort |
| Spouse | Margaret Beauchamp |
| Issue Detail | Margaret Beaufort, Countess of Richmond and Derby |
| Father | John Beaufort, 1st Earl of Somerset |
| Mother | Margaret Holland |
John Beaufort, 1st Duke of Somerset, 3rd Earl of Somerset, KG (25 March 1404 – 27 May 1444) was an English nobleman and military commander during the Hundred Years' War. He was the maternal grandfather of Henry VII.