||This article needs to be updated. (January 2013)
San Luis Rey is an unincorporated community in San Diego County, California. San Luis Rey is along the San Luis Rey River 4 miles (6.4 km) northeast of downtown Oceanside, but is completely surrounded by Oceanside's city boundaries. San Luis Rey has a post office with ZIP code 92068, which was opened in 1861.
The community was named for Mission San Luis Rey de Francia, which is located near the geographic center of the neighborhood.
According to the Köppen Climate Classification system, San Luis Rey has a warm-summer Mediterranean climate, abbreviated "Csa" on climate maps.