Dyffryn Cennen is a community located in Carmarthenshire, Wales. The population of the community taken at the 2011 census was 1,176.
The community is bordered by the communities of: Manordeilo and Salem; Llangadog; Cwmamman; Llandybie; Llanfihangel Aberbythych; and Llandeilo, all being in Carmarthenshire.
Coordinates: 51°51′36″N 3°59′06″W / 51.85996°N 3.98495°W