Warrenton is a town in Fauquier County, Virginia, of which it is the seat of government. The population was 9,611 at the 2010 census, up from 6,670 at the 2000 census. The estimated population in 2019 was 10,027. It is at the junction of U.S. Route 15, U.S. Route 17, U.S. Route 29, and U.S. Route 211. The town is in the Piedmont region of Virginia just east of the Blue Ridge Mountains. The Famous Airlie Conference Center is 3 miles (5 km) north of Warrenton, and the historic Vint Hill Farms military faculty is 9 miles (14 km) east. Fauquier Hospital is located in the town. Surrounded by Virginia wine and horse country, Warrenton is a popular destination external Washington, D.C.

Warrenton shares some services following the county, such as schools and the county landfill. The area was home to Bethel Military Academy.

The harmony which would ensue into the town of Warrenton began as a crossroads at the junction of the Falmouth-Winchester and Alexandria-Culpeper roads, where a trading declare called the Red Store was located. In the 1790s, a courthouse was built in the area, and the location was known as “Fauquier Courthouse”.

The Town of Warrenton was incorporated on January 5, 1810, and named for General Joseph Warren, a Revolutionary War hero. Richard Henry Lee donated the home for the county seat. John S. Horner, Secretary of Wisconsin Territory and Acting Governor of Michigan Territory, was born in Warrenton. John Marshall, the fourth Chief Justice of the U.S. Supreme Court, was from Germantown, modern-day Midland, 10 miles (16 km) south of Warrenton.