Dyffryn Clydach is a community of Neath Port Talbot county borough, Wales. It is coterminous with the Dyffryn electoral ward.
Located in an area of South Wales between Neath and Swansea, Dyffryn Clydach has its own community council, made up of thirteen councillors. Dyffryn Clydach includes the residential communities of Cwrt Herbert, Dyffryn, Highlands, Longford, Neath Abbey, and Penshannel.
Although covering only 7 km2 (2.7 sq mi), the area is packed with history, including the ruins of Neath Abbey. The current Tesco store is believed to occupy the site of an 11th-century castle.
The more central and northerly parts of the ward are mostly rural, consisting of picturesque farmland and woodland encircling the western base of Mount Drummau. The Clydach Brook flows through Dyffryn Clydach in a north to south direction, passing Neath Abbey. The woodland surrounding the river forms a public park.
There is a business park to the south of the community area with a junction onto the A465 trunk road which, heading east, joins the M4 Motorway at Junction 43, less than five minutes away. There are three local schools: Neath Abbey infant and Early Years School, Mynachlog Nedd Juniors, and Dwr Y Felin Lower School.
Near the business park are located the ruins of the Cistercian monastery of Mynachlog Nedd, the Tennant Canal, and Neath Abbey Ironworks. There is much woodland in the area with footpaths maintained by the community council.
Longford Memorial Hall is a recently refurbished community centre and village hall and has two committee rooms. There is also a community centre at Cwrt Herbert.
The Dyffryn electoral ward comprises some or all of the following areas: Bryncoch, Cwrt Herbert, Longford, Neath Abbey, Darran Wood, Rhydhir, and Stanley Wood in the parliamentary constituency of Neath.
Dyffryn is bounded to the north by Allt-Wen ward; to the east by Bryncoch North and Bryncoch South; to the south by Neath East; to the southwest by Coedffranc North and Coedffranc Central; and to the west by the wards of Llansamlet and Clydach (both in Swansea).
Voter turnout in the local council elections of 2012 was 44.1%. The results were: