White Rock is an unincorporated community and census-designated place (CDP) in Los Alamos County, New Mexico. It is one of two major population centers in the county; the other is Los Alamos. The population was 5,725 at the 2010 census. It is largely a bedroom community for employees of Los Alamos National Laboratory and their families. Access to White Rock from the town of Los Alamos and other cities and towns in New Mexico is via New Mexico State Road 4, which forms the northwestern boundary of the community. Administratively, White Rock is a neighborhood of Los Alamos; locals refer to Los Alamos as "the Townsite," or "the Hill".

Los Alamos County is a county in the U.S. state of New Mexico. As of the 2020 census, the population was 19,419. The smallest county by area in the state, Los Alamos County was formerly administered exclusively by the U.S. federal government during the Manhattan Project, but it now has equal status to New Mexico's other counties. The county has two census-designated places: Los Alamos and White Rock.