Westbury is a market town and civil parish in west Wiltshire, England. The town lies below the northwestern edge of Salisbury Plain, about 4 miles (6Â km) south of Trowbridge and a similar distance north of Warminster.
Westbury was known for the annual Hill Fair where many sheep were sold in the 18th and 19th centuries; later growth came from the town's position at the intersection of two railway lines. The busy A350, which connects the M4 motorway with the south coast, passes through the town. The urban area has expanded to include the village of Westbury Leigh and the hamlets of Chalford and Frogmore.