Lookout Mountain, Mountain peak in Walker County, United States

Lookout Mountain is a summit in Walker County, northern Georgia, standing at 729 meters (2,392 feet) above sea level. The ridge forms a natural border between surrounding valleys and extends for several miles along the Tennessee boundary.

On November 24, 1863, the Battle of Lookout Mountain, called the "Battle Above the Clouds," was fought here as the second day of the Battle of Chattanooga. Confederate Generals Braxton Bragg and James Longstreet used Sunset Rock, then Point Lookout, to track Union troops entering Lookout Valley; Union forces could see Longstreet there and deciphered Confederate signals. The Union victory at Wauhatchie lifted the siege of Chattanooga.

The Chickamauga Cherokee called the mountain Chat-a-nu-ga, the name later given to the city below. On the summit, patterns of boulders suggest lanes or walls once stood there, though no physical evidence of habitation has been found. The name Lookout Mountain appears on Mathew Carey's Map of The Tennessee Government of 1795.

Several marked trails lead up to the summit, with parking available at the main trailheads. Information boards along the routes show details about local wildlife and plant life, and provide guidance for navigating the terrain.

From the Rock City overlook, a marker claims that seven U.S. states are visible: Tennessee, Kentucky, Virginia, South Carolina, North Carolina, Georgia and Alabama. The same claim appears on many barn roofs in the area, though no scientific investigation has upheld it.