Dafydd ap Llywelyn
| Dafydd ap Llewelyn | |
|---|---|
| Dafydd with his father Llywelyn ab Iorwerth and half-brother Gruffudd | |
| King of Gwynedd | |
| Reign | 1240–1246 | 
| Predecessor | Llywelyn ab Iorwerth | 
| Successor | Llywelyn ap Gruffudd | 
| Born | March 1212 Castell Hen Blas, Coleshill, Bagillt, Flintshire, Wales | 
| Died | 25 February 1246 (aged 33) Abergwyngregyn | 
| Burial | |
| Spouse | Isabella de Braose | 
| Issue | Dafydd ap Dafydd ap Llywelyn | 
| House | Aberffraw | 
| Father | Llywelyn ab Iorwerth | 
| Mother | Joan, Lady of Wales | 
Dafydd ap Llywelyn (c. March 1212 – 25 February 1246) was King of Gwynedd from 1240 to 1246.