Mydroilyn is a village in the parish of Llanarth, Ceredigion, Wales, situated along the B4342 road.
The name of the village is derived from the confluence of the Mydr and the Oilyn; two streams in the village.
Of particular note, is the 200-year-old farmhouse Aelybryn, which once belonged to a Welsh landowner, [1] the Anglican Holy Trinity Church,[2] the Mydroilyn Independent Chapel, dated to 1898 by David Davies, the Y Ficar Wesleyan Chapel, dated to 1849, and the small 19th century corn-mill named Y Felin.[3]