Middletown is a town in Frederick County, Virginia, United States. The population was 1,015 at the 2000 census.
Belle Grove Plantation, about a mile southwest of Middletown, was first settled in about 1750 and its historic Federal-style manor house was completed in 1797. Middletown has been the site of numerous military operations in the American Civil War including the Battle of Cedar Creek, fought just south of the town. The area where this battle occurred has been protected as part of the Cedar Creek and Belle Grove National Historical Park. Because the town was founded long before the Civil War, its antebellum history is extensive, as evidenced by the fact that Middletown's Wayside Inn purports to be the longest continuously running inn in America. The town is home to Lord Fairfax Community College.
Middletown is located at 39°1′41″N 78°16′45″W / 39.02806°N 78.27917°W / 39.02806; -78.27917 (39.027989, -78.279273).