Thornbury is a market town and civil parish in the South Gloucestershire unitary authority area of England, about 12 miles (19 km) north of Bristol.

The Domesday Book of 1086 noted a manor of "Turneberie" belonging to William the Conqueror’s consort, Matilda of Flanders, with 104 residents.

[3][4] Domesday Book noted a manor of "Turneberie" belonging to William the Conqueror's consort, Matilda of Flanders, with 104 residents.

The town charter was granted in 1252 by Richard de Clare, 6th Earl of Gloucester and lord of the manor of Thornbury.

[7] In 1765 Dr John Fewster of Thornbury presented a paper to the Medical Society of London entitled "Cow Pox and its Ability to Prevent Smallpox".

The site of Thornbury railway station and the line have been redeveloped into a supermarket, a housing estate, a bypass road and a long footpath.

There are plans to reopen the line to Yate via Tytherington and Iron Acton and possibly restore services to Gloucester and Bristol.

This closed in the late 1990s and was partly replaced by a smaller one in a car park near the United Reformed Church.

The other three families held the manor at Thornbury over several centuries, with the Latin motto Decus Sabrinae Vallis (Jewel of the Severn Vale).

[15] Thornbury is one of a handful of UK towns to have a social group for adults with autism or Asperger syndrome.

[16][17] Thornbury market garden grows vegetables by sustainable natural methods and supplies them to the local area.

Some local amateur groups are: One of the biggest firms on the industrial estate in the south of the town is Essilor, which produces spectacle lenses.

One of town's notable features is its castle, a Tudor structure begun in 1511 as a home for Edward Stafford, 3rd Duke of Buckingham.

[23] Cardinal Wolsey had the Duke beheaded for treason in 1521, after which the castle was confiscated by King Henry VIII, who himself stayed there for ten days in 1535 with Anne Boleyn.

Thornbury Castle fell into disrepair after the English Civil War, but was renovated in 1824 by the Howard Family.

The rest of his remains were buried in Keynsham Abbey, Somerset, which did not survive the dissolution of the monasteries under Jasper's great-nephew Henry VIII of England.

[27] The town pump on a small island at the bottom of the High Street shows a hand pointing "To Gloucester".

Thornbury community garden was set up near Gillingstool School, but it has closed due to housing development.

The youth section, providing for children from six years old and up, was formed in 1990 as a separate club (Thornbury Falcons).

[33] In 2016, an area of land adjacent to the Mundy Playing Fields, known as Poulterbrook, was converted into two purpose-built youth football pitches, as well as allotments for the local community.

The nearby nuclear power station at Oldbury-on-Severn, Tytherington quarry and Stokefield Close were all used as locations for the 1976 four-part Doctor Who serial The Hand of Fear.