Merthyr Mawr is a village and community in Bridgend, Wales. The village is about 2½ miles from the centre of Bridgend town. The population of the community at the 2011 census was 267. The community occupies the area west of the Ewenny River, between Bridgend and Porthcawl. It takes in the settlement of Tythegston and a stretch of coastal sand dunes known as Merthyr Mawr Warren. It is in the historic county of Glamorgan.
Buildings and landmarks of note
Merthyr Mawr House is an early 19th-century mansion built by Sir John Nicholl and set in an extensive park. Within the park is the Iron Age hillfort known as Chapel Hill Camp, and within the embankments is the now roofless 15th century chapel of St Roque (or Roch), which houses two early medieval inscribed stones.
Merthyr Mawr is largely an estate village for the House. It now contains several cottages retaining thatched roofs and well maintained gardens. At the south end of the village is the parish church of St Teilo, which was built in 1849–51 to a design by Benjamin Ferrey and John Pritchard, on an ancient medieval site. A collection of stones from the former churchyard and the surrounding area are displayed in a shelter in the churchyard.
The River Ogmore flows through the village and a famous sheep dipping bridge crosses it on the outskirts of the village. The former POW Camp Island Farm is less than a mile away. The Ewenny River forms the southern boundary of both the community and the borough. The villages of Ewenny and Ogmore-by-Sea are both on the southern bank of the Ewenny, along with Ogmore Castle.
There are large number of archaeological sites in the Community area, showing habitation from Neolithic times, and intensive occupation since Roman times. Thirteen sites are Scheduled Monuments, which gives them legal protection from disturbance:-
- Tythegston Long Barrow ( , SS864792). A Neolithic chambered tomb toward the east end of a long mound.
- Mynydd Herbert Round Barrow (Bronze Age burial cairn 2m high covered in stones, possibly cleared from nearby fields, in the corner of a field 1 km north of Tythegston. , SS851798) A
- Chapel Hill Camp ( , SS889780) A small Iron Age hillfort on a low hilltop. The ruins of St Roques chapel, lying within the enclosure, gives its name to the hill.
- Merthyr Mawr Warren ( , SS863770) An area of dunes within which numerous prehistoric burial sites and other findspots have been uncovered, especially during sand and gravel extraction.
- Cae Summerhouse Camp (Iron Age & Roman periods. , SS864779). A settlement site with intensive 1st to 4th century occupation in a defended enclosure, covering the
- Merthyr Mawr pre-Norman Stones ( , SS882775) A series of locally found early medieval stone pillars, slabs and crosses, now housed in a shelter within Merthyr Mawr St Teilo churchyard.
- Vervil Dyke ( , SS889774) A bank and ditch runs between the rivers Ogmore and Eweny. Traces of a parallel bank imply a settlement enclosure of early medieval date.
- Cross in Tythegston Churchyard ( , SS857788) An 11th-century sandstone slab set in a modern socket, in St Tudwg's churchyard, Tythegsto.
- St Roque's Chapel ( , SS888780) A ruined medieval chapel, sited inside Chapel Hill Camp, within the park of Merthyr Mawr House.
- Conbelani Stone in St Roque's Chapel ( ,SS888780) An inscribed pillar cross, originally on the river bank at Merthyr Mawr. Another cross pillar, the Goblin Stone, is also in the ruined chapel.
- Candleston Castle ( , SS871772) A lightly fortified 14th century manor house overlooking Merthyr Mawr Warren, which continued in occupation until the 19th century.
- Merthyr Mawr Churchyard Cross ( , SS882774) An octagonal 14th century cross pillar with part of its original finial, set in three steps of sandstone.
- New Inn Bridge ( , SS891783) A Stone bridge in the parish, but near Bridgend. It has 4 arches, and is dated to the 16th century or older. Two openings allow sheep washing, giving an alternate name of 'Dipping Bridge'.
National nature reserve
The sand dune system known as Merthyr Mawr warren is a scheduled National Nature Reserve. It contains the highest sand-dunes in Wales and is notable for its floristic and animal communities including rare plants. It has also been the site of many archaeological finds. 
- "Community population 2011". Retrieved 6 November 2015.
- Glamorgan-Gwent Archaeological Trust Historic Landscapes: Merthyr Mawr accessed 11 May 2013
- coflein website NPRN: 94522. Glamorgan-Gwent Archaeological Trust PRN: 00287m. Cadw SAM: GM022: Tythegston Long Barrow
- coflein website NPRN: 301290. Glamorgan-Gwent Archaeological Trust PRN: 00228m. Cadw SAM: GM025: Mynydd Herbert Round Barrow
- coflein NPRN: 94625. Glamorgan-Gwent Archaeological Trust PRN: 00275m. Cadw SAM: GM248: Chapel Hill Camp
- coflein NPRN: 308713. Glamorgan-Gwent Archaeological Trust PRN: 01015m. Cadw SAM: GM432: Merthyr Mawr Warren
- coflein NPRN: 301305. Glamorgan-Gwent Archaeological Trust PRN: 00246m. Cadw SAM: GM102: Cae Summerhouse Camp
- coflein NPRN: 301386. GGAT PRN: 00279m. Cadw SAM: GM169: Pre-Norman Stones in Churchyard
- coflein NPRN: 94715. GGAT PRN: 02260.0m. Cadw SAM: GM465: Vervil Dyke
- coflein NPRN: 307244. GGAT PRN: 00263m. Cadw SAM: GM214: Cross in Tythegston Churchyard
- coflein NPRN: 93143. GGAT PRN: 00248m. Cadw SAM: GM247: St Rogue's Chapel
- coflein NPRN: 275853. GGAT PRN: 01335m. Cadw SAM: GM026: Merthyr Mawr Inscribed Stones (now in St Rogue's Chapel)
- coflein NPRN: 93050. GGAT PRN: 00258m. Cadw SAM: GM095: Candleston Castle
- coflein NPRN: 307247. GGAT PRN: 00233m. Cadw SAM: GM226: Merthyr Mawr Churchyard Cross
- coflein NPRN: 24135. GGAT PRN: 00277m. Cadw SAM: GM050: New Inn Bridge
- "Merthyr Mawr Warren National Nature Reserve, near Bridgend". Natural Resources Wales. Retrieved 3 September 2020.
- for Merthyr Mawr