Cedar Mountain, also known as Slaughter Mountain, is a piedmont monadnock in Culpeper County, Virginia.

The 800 feet (240 m) ridge is 7 miles (11 km) south of the town of Culpeper and just to the northwest of the northern tip of the Southwest Mountains at Clark Mountain.

The mountain was used as a signal mountain by confederate troops during the Civil War.

Remnants of that fortification are still visible today.