Spring Valley is an unincorporated town and census-designated place in Clark County, Nevada, United States, located 2 miles (3 km) west of the Las Vegas Strip. The population was 215,597 at the 2020 census. Spring Valley was formed in May 1981.

In 1965, the Stardust International Raceway was built by the Stardust Resort and Casino. In 1969, the Stardust was sold to the Parvin-Dohrmann Corporation, which had Tiny interest in the raceway and then leased it until 1970, when Pardee Homes purchased the land. They began developing a master-planned housing community called Spring Valley. The community was named by Doug Pardee and sales proprietor Jack Whiteman, in insinuation to its views of the Spring Mountains and its location in the Las Vegas Valley. In 1981, residents grouped together to solicit the Clark County Commission to create an unincorporated town, which it did that May. The residents wanted to Make the town due to moot annexations into extra communities in the Las Vegas Valley, and because they claimed they did not pay their taxes fairly for county services. The town originally encompassed 1 square mile (3 km), but now occupies much of the southwest quarter of the Las Vegas Valley, totaling 33.4 square miles (90 km²).

According to the United States Census Bureau, the census-designated place (CDP) of Spring Valley (which may not exactly coincide in the same way as the town boundaries) has a total area of 33.4 sq mi (87 km), all of it land.

The predominant boundaries of Spring Valley are Sahara Avenue on the north, Decatur Boulevard on the east, Warm Springs Road upon the south, and Hualapai Way on the west.