Harpers Ferry is a historic town in Jefferson County, West Virginia, United States. It was formerly spelled Harper's Ferry with an apostrophe and that form continues to appear in some references. It is situated at the confluence of the Potomac and Shenandoah rivers where the U.S. states of Maryland, Virginia and West Virginia meet. It is the easternmost town in West Virginia. The town's original, lower section is on a flood plain created by the two rivers and surrounded by higher ground. Historically, Harpers Ferry is best known for John Brown's raid on the Armory in 1859 and its role in the American Civil War. The population was 286 at the 2010 census.
The lower part of Harpers Ferry is within Harpers Ferry National Historical Park. Most of the remainder, which includes the more highly populated area, is included in the separate Harpers Ferry Historic District. Two other National Register of Historic Places properties adjoin the town: the B & O Railroad Potomac River Crossing and St. Peter's Roman Catholic Church. Harpers Ferry and the adjoining town of Bolivar, though legally two distinct municipalities, together form one large town.