Topanga is an unincorporated area in western Los Angeles County, California, USA. It is located in the Santa Monica Mountains. Occupying Topanga Canyon, it is often referred to by that name. Topanga is 12,748 acres (52 km2) in size, and is bounded on three sides by State Park or conservancy lands, and on the south by the Pacific Ocean and a small strip of Malibu, which is the main community to the west. On the east is Pacific Palisades. Topanga has a population of 5,441 as of 2000.
Topanga is the name given to the area by the Tongva tribe, and may mean "a place above." It was the western border of their territory, abutting the Chumash tribe that occupied the coast from Malibu northwards. Bedrock mortars can be found carved into rock outcroppings in many locations.
Topanga was first settled in 1839. Among the first settlers were the Trujillo and Cheney families.
In the 1920s, Topanga Canyon became a weekend getaway for Hollywood stars with several cottages built for that purpose. The rolling hills and ample vegetation served to provide both privacy and attractive surroundings for the rich and famous.