Valley was a populated place and post office on the South Branch line of the Baltimore and Ohio Railroad in the U.S. state of West Virginia. It was centered near the intersection of West Sioux Lane and Depot Valley Road, now located within the present-day corporate boundaries of Romney. Valley developed in 1884 following the completion of the South Branch line when the rail line's original southern terminus and corresponding Romney Depot were built there. The United States Post Office Department established a post office at Valley on May 19, 1928, remaining in operation until its disestablishment on June 15, 1937. Following the closure of Valley's post office, its mail was routed through the post office in Romney.

The South Branch Valley Railroad is a 52.4-mile-long (84.3 km) railroad in the Eastern Panhandle of West Virginia. The branch line, which parallels the South Branch Potomac River, runs north from Petersburg to Green Spring, where it connects to the national rail network at a junction with the CSX Cumberland Subdivision.