Llanddulas is a village in Conwy county borough, Wales midway between Old Colwyn and Abergele and next to the North Wales Expressway. The village lies beneath the limestone hill of Cefn-yr-Ogof (669 ft). This hill has large caves, and quarrying of limestone was formerly the main industry of the village, with crushed stone being exported from the 200 m long jetty.
According to figures from the 2001 census, Llanddulas, combined with nearby village Rhyd y Foel, had a population of 1,572, with around 23% of the population having some knowledge of the Welsh language.
Llanddulas is notable as being the place where Richard II was betrayed in 1399. and is also the birthplace of Lewis Valentine. Between 1889 and 1952 the village had its own railway station.
Coordinates: 53°17′N 3°38′W / 53.283°N 3.633°W