Pine Valley is a community and census-designated place (CDP) in the Cuyamaca Mountains of the Mountain Empire area, in southeastern San Diego County, California. The population was 1,510 at the 2010 census, up from 1,501 at the 2000 census.

Pine Valley is named for the locally unique strand of Jeffrey pine (Pinus jeffreyi) found along Pine Valley Creek, a seasonal drainage in the foothills of the Laguna Mountains in central San Diego County. According to the United States Geological Survey, Pine Valley is located 3,736 feet (1,139 m) above sea level, at 32°49′17″N 116°31′45″W / 32.82139°N 116.52917°W / 32.82139; -116.52917. Interstate 8 passes east-to-west along the southern be next to of Pine Valley, and crosses Laguna Summit (altitude 4,055 feet (1,236 m)) just to the east of the town. The Sunrise Highway marks the eastern border of the town.

According to the United States Census Bureau Pine Valley is located at 32°49′41″N 116°31′36″W / 32.82806°N 116.52667°W / 32.82806; -116.52667 (32.828184, -116.526583), which is close the middle of the Pine Valley census-designated place (CDP). The Pine Valley CDP has a total Place of 7.1 square miles (18 km²), all land.

According to the Köppen Climate Classification system, Pine Valley has a warm-summer Mediterranean climate, abbreviated “Csb” on climate maps. The extreme high temperature is 110F, with the extreme low being −4F. Average annual precipitation is 23.66 inches (60.1 cm), mostly falling amid November and March. Snow sometimes falls during winter storms, but usually melts rapidly.