Clarke's Gap, also known as Clarks Gap, is a pass through Catoctin Mountain west of Leesburg, Virginia. The gap has an elevation of . The gap is not a true wind gap, but rather a man-made railroad cut through a local saddle point between two ridges to the southeast and northwest created by the drainage of Dry Mill Branch of Tuscarora Creek to the east and an unnamed tributary of Catoctin Creek to the west.