Westbury White Horse or Bratton White Horse is a hill figure on the escarpment of Salisbury Plain, approximately 1.5 mi (2.4 km) east of Westbury in Wiltshire, England. Located on the edge of Bratton Downs and lying just below an Iron Age hill fort, it is the oldest of several white horses carved in Wiltshire. It was restored in 1778, an action which may have obliterated another horse that had occupied the same slope. A contemporary engraving from around 1772 appears to show a horse facing in the opposite direction that was rather smaller than the present figure. There is, however, no documentation or other evidence for the existence of a chalk horse at Westbury before 1772.

The horse is 180 ft (55 m) tall and 170 ft (52 m) wide and has been adopted as a symbol for the town of Westbury, appearing on welcome signs and the logo of its tourist information centre. It is also considered a symbol for Wiltshire as a whole.