Winchester is the northwesternmost independent city in the Commonwealth of Virginia, United States. It is the county seat of Frederick County, although the two are separate jurisdictions. As of the 2020 census, the city's population was 28,120. It is the principal city of the Winchester metropolitan area with a population of just over 145,000 extending into West Virginia, which is a part of the Washington–Baltimore combined statistical area. Winchester is home to Shenandoah University and the Museum of the Shenandoah Valley.

A county seat is an administrative center, seat of government, or capital city of a county or civil parish. The term is in use in five countries: Canada, China, Hungary, Romania, and the United States. An equivalent term, shire town, is used in the U.S. state of Vermont and in several other English-speaking jurisdictions. County towns usually serve a similar function in Ireland, Jamaica, and the United Kingdom.