Westbury railway station serves the market town of Westbury in Wiltshire, England. The station is managed by Great Western Railway.

The station is a major junction, serving the Reading to Taunton line with services to and from Penzance and London Paddington; the Wessex Main Line with services to and from Cardiff and Portsmouth, also Swindon; the Heart of Wessex Line with local services from Bristol Temple Meads to Weymouth; and services to London Waterloo.

The buffet at Westbury appeared in a list of "highly commended" station cafes published in The Guardian in 2009.

The station was opened by the Wilts, Somerset and Weymouth Railway on 5 September 1848, and was the initial terminus of their line from Chippenham. This line was later extended to Frome, which opened on 7 October 1850. The Salisbury branch opened on 30 June 1856, whilst the opening of the line to Patney & Chirton in 1900 (along with that further west from Castle Cary to Cogload Junction six years later) completed the GWR's new main line from London Paddington to Taunton and beyond.

In the 1880s, the station was one of the meeting places of the South and West Wilts Hunt.

In 1899, Westbury station was entirely rebuilt to cater for the 1900 line, creating two island platforms six hundred feet long and forty feet wide. It has since been rebuilt and remodelled several times, most recently when the area was resignalled in 1985 (when the Down Salisbury platform line was lifted), but without changing the underlying form created in 1901. In 2013 the Swindon and Wiltshire Local Transport Body prioritised the reopening of this platform face at an estimated cost of £5.4m.

A freight yard next to the station is used by bulk limestone trains from the rail-served quarries at Merehead and Whatley in Somerset. In April 2009 the rail-served Lafarge cement works to the east was closed.

On 28 October 1873, a mail train passed a signal at danger and collided with a luggage train.

On 6 December 2011, a train was derailed at Westbury.

The station is served by all three main routes that pass through it. On the main Reading to Taunton Line, the station is served by westbound trains to one of Exeter St Davids, Paignton, Plymouth, or Penzance; and eastbound services to London Paddington, which depart approximately once every two hours.

There is a service on the Cardiff Central to Southampton Central and Portsmouth Harbour Wessex Main Line, and a separate service between Gloucester, Bristol and Westbury on this route. Some of these trains continue through to Weymouth and in the opposite direction certain trains extend through to Cheltenham Spa and Great Malvern. Others run to Frome, Warminster and Southampton.

There are also services between Westbury and Swindon via Chippenham, Trowbridge and Melksham, marketed as the TransWilts Line. The frequency on this route was improved substantially (to eight trains each way weekdays, five on Sundays) at the December 2013 timetable change.

Preceding station	National Rail			Following station
Pewsey		Great Western Railway (London to Devon and Cornwall)		Castle Cary
Trowbridge		Great Western Railway (Wessex Main Line)		Dilton Marsh or Warminster
		Great Western Railway (Heart of Wessex Line)		Frome
Warminster		South Western Railway (Basingstoke - Yeovil)		Frome

The line to Westbury is not due to be electrified as part of the 21st-century modernisation of the Great Western Main Line. Although local councillors support it, the extension of electrification beyond Newbury to Westbury was assessed as having a benefit–cost ratio of only 0.31.

• Video footage of Westbury railway station