Ogof Nadolig

Ogof Nadolig is a cave in the Alyn Gorge near Cilcain, Flintshire, Wales. It is mostly crawling, 300 m long, and ends with a shaft up to the surface and a locked manhole cover.

Nearby, but closer to the river, are the caves Ogof Hesp Alyn and Ogof Hen Ffynhonnau.

Its name derives from the fact that it was discovered on Christmas Day.