Dunster is a village and civil parish in Somerset, England, within the north-eastern boundary of Exmoor National Park. It lies on the Bristol Channel 2.5 miles (4 km) southeast of Minehead and 20 miles (32 km) northwest of Taunton. At the 2011 Census, it had a population of 817.

There are Iron Age hillforts in the area. Saxon Dunster was a parish in the Hundred of Carhampton. In the Domesday book there are four manors within the parish: Aucome (Alcombe), Avena (Avill), Stantune (Stanton) and Torre. Torre is now the site of the village of Dunster. Torre, including the castle and two watermills, was valued at 15 shillings and Aucome 20 shillings. The village grew up around Dunster Castle which was built at Torre by the Norman warrior William I de Moyon (d. post 1090) shortly after the Norman Conquest of 1066. The castle is mentioned in the Domesday Book of 1086. From that time it was the caput of the Feudal barony of Dunster. The castle was remodelled on several occasions by the Luttrell family who were lords of the manor from the 14th to 20th centuries. The benedictine Dunster Priory was established in about 1100. The Priory Church of St George, dovecote and tithe barn are all relics from the Priory.

The village became a centre for wool and cloth production and trade, of which the Yarn Market, built by George Luttrell (d.1629), is a relic. There existed formerly a harbour, known as Dunster Haven, at the mouth of the River Avill, but today, the coast having receded, it is now about one-half mile (0.80 km) from the village and no sign of the harbour can be seen on the low lying marshes between the village and the coast. Dunster has a range of heritage sites and cultural attractions which combine with the castle to make it a popular tourist destination with many visitors arriving on the West Somerset Railway, a heritage railway running from Minehead to Bishops Lydeard.

The village lies on the route of the Macmillan Way West, Somerset Way and Celtic Way.^{[citation needed]}

The name Dunster derives from: Dun," A dun is an ancient or medieval fort" and chester, commonly indicates that the place is the site of a Roman castrum.

Within two miles (3.2 km) of the village itself are several Iron Age hillforts showing evidence of early human occupation. These include Bat's Castle and Black Ball Camp on Gallox Hill, Long Wood Enclosure and a similar earthwork on Grabbist Hill.

Dunster is mentioned as a parish and Dunster Castle as belonging to William I de Moyon (alias de Moion, also de Mohun) in the 1086 Domesday Book. After the Norman conquest of England in the 11th century, he constructed a timber castle on the site as part of the pacification of Somerset. A stone shell keep was built on the motte by the start of the 12th century, and the castle survived a siege during the early years of the Anarchy. At the end of the 14th century the de Mohuns sold the castle to the Luttrell family, who continued to occupy the property until the late 20th century. During the English Civil War, Dunster was initially held as a garrison for the Royalists. It fell to the Parliamentarians in 1645 and orders were sent out for the castle to be demolished. However, these were not carried out, and the castle remained the garrison for Parliamentarian troops until 1650. Dunster is regularly home to Taunton Garrison who re-enact plays, battles, and life in the civil war. Major alterations to the castle were undertaken by Henry Fownes Luttrell who had acquired it through marriage to Margaret Fownes-Luttrell in 1747. Following the death of Alexander Luttrell in 1944, the family was unable to afford the death duties on his estate. The castle and surrounding lands were sold off to a property firm, the family continuing to live in the castle as tenants. The Luttrells bought back the castle in 1954, but in 1976 Colonel Walter Luttrell gave Dunster Castle and most of its contents to the National Trust, which operates it as a tourist attraction. It is a Grade I listed building and scheduled monument.

Dunster Priory was established as a Benedictine monastery around 1100. The first church in Dunster was built by William de Mohun who gave the church and the tithes of several manors and two fisheries, to the Benedictine Abbey at Bath. The priory, which was situated just north of the church, became a cell of the abbey. The church was shared for worship by the monks and the parishioners, however this led to several conflicts between them. One outcome was the carved rood screen which divided the church in two with the parish using the west chancel and the monks the east. The priory church is now in parochial use as the Priory Church of St George which still contains 12th and 13th century work, although most of the current building is from the 15th century. It has been designated as a Grade I listed building. In 1332 it became more separated from the Abbey at Bath and became a priory in its own right. In the "Valor Ecclesiasticus" of 1535 the net annual income of the Dunster Tithe Barn is recorded as being £37.4.8d (£37 23p), with £6.13s7d ( £6.68p ) being passed on to the priory in Bath. In 1346 Cleeve Abbey built a nunnery in Dunster, but it was never inhabited by nuns and was used as a guest house. The priory was dissolved as part of the dissolution of the monasteries in 1539. Dunster was part of the hundred of Carhampton, but St George's was the seat of the local deanery, overseeing the area's parish churches.