Warrenton is a town in Fauquier County, Virginia, United States. The population was 9,611 at the 2010 census, up from 6,670 at the 2000 census. The estimated population in 2015 was 9,897. Warrenton is the county seat of Fauquier County. 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, east of the Blue Ridge Mountains. The well-known Airlie Conference Center is 3 miles (5 km) north of Warrenton, and the historic Vint Hill Farms military facility 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 outside of Washington, D.C.

Like many incorporated towns in Virginia, the town of Warrenton has government and taxation separate from the county. The town and the county do share some services, such as schools and the county landfill.

The settlement which would grow into the town of Warrenton began as a crossroads at the junction of the Falmouth-Winchester and Alexandria-Culpeper roads, where a trading post 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 land 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.

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