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is a census-designated place (CDP) in San Luis Obispo County, California, United States. The population was 4,687 at the 2000 census.
Templeton is located at (35.553847, -120.709469). It is approximately five miles south of Paso Robles and five miles (8 km) north of Atascadero along U.S. 101. State Route 46 intersects U.S. 101 on the north edge of the town.
According to the United States Census Bureau, the CDP has a total area of 4.7 square miles (12.3 km²), all of it land. However, much of the surrounding unincorporated area between Atascadero and Paso Robles also considers itself part of Templeton, and U.S. mail is addressed likewise.