Aust is a small village in South Gloucestershire, England, about 10 miles (16 km) north of Bristol and about 28 miles (45 km) south west of Gloucester. It is located on the eastern side of the Severn estuary, close to the eastern end of the Severn Bridge which carries the M48 motorway. The village has a chapel, a church and a public house. There is a large area of farmland on the river bank, which is sometimes flooded due to the high tidal range of the Severn. Aust Cliff, above the Severn, is located about 0.5 miles (0.80 km) from the village. The civil parish of Aust includes the villages of Elberton and Littleton-upon-Severn.

South Gloucestershire is a unitary authority area in the ceremonial county of Gloucestershire, South West England. Towns in the area include Yate, Chipping Sodbury, Kingswood, Thornbury, Filton, Patchway and Bradley Stoke. The southern part of its area falls within the Greater Bristol urban area surrounding the city of Bristol.