Tidworth is a garrison town and civil parish in south-east Wiltshire, England, on the eastern edge of Salisbury Plain. Lying on both sides of the A338 about 3+1⁄2 miles north of the A303 primary route, the town is approximately 8 miles west of Andover, 12 miles south of Marlborough, and 13 miles north by north-east of Salisbury. The population of the parish at the 2011 census was approximately 10,600.