| Dafydd III | |
|---|---|
| Prince of Aberffraw Lord of Snowdon | |
 Coat of Arms of Dafydd III | |
| Prince of Gwynedd | |
| Reign | 1246–1282 |
| Predecessor | Dafydd ap Llywelyn[a] |
| Successor | Abolished |
| Prince of Wales | |
| Reign | 1282–1283 |
| Predecessor | Llywelyn ap Gruffudd |
| Successor | English title: Edward of Carnarvon (1301-1307) Welsh title: Owain Glyndwr (1400/15) |
| Born | 11 July 1238 Gwynedd, Wales |
| Died | 3 October 1283 (aged 45) Shrewsbury, England |
| Spouse | Elizabeth Ferrers |
| Issue | Amongst others: Llywelyn ap Dafydd Owain ap Dafydd Gwladys ferch Dafydd |
| House | Aberffraw |
| Father | Gruffudd ap Llywelyn ap Iorwerth |
| Mother | Senana ferch Caradog |
Dafydd ap Gruffudd, also known as Dafydd III (11 July 1238 – 3 October 1283), was a Prince of Gwynedd until after the death of his brother, Llywelyn ap Gruffudd, when he proclaimed himself as the Prince of Wales from 11 December 1282. He became a fugitive after waging war against the English occupation of Wales, but was captured, and then executed on 3 October 1283, which were on the orders of King Edward I of England. He was the last native Prince of Wales before the conquest of Wales by Edward I in 1283.
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