Camarillo (pronounced /ˌkæməˈriːoʊ/ ) is a city in Ventura County, California, United States. The population was 57,077 at the 2000 census. A January 1, 2006 California Department of Finance estimate lists the population at 64,034. The Ventura Freeway (U.S. Route 101) is the city's primary thoroughfare.

Camarillo is named for Adolfo Camarillo, one of the few Californios (pre-1851 California natives of Spanish ancestry) to preserve the city's heritage after the arrival of Anglo settlers. As with most cities in Ventura County, it is noted for its resistance to urban sprawl. Some of the most desirable land in the city limits, located on the north and south sides of the Ventura Freeway, is permanently zoned for agricultural use. Recently, however, the city has seen a great deal of growth that has been decried by area residents as environmentally destructive and not well enough planned. It is also home to the Ventura County, California Sheriff's Department Academy, as well as the department's other assets; such as the VCSD Air Unit, SWAT Unit, Bomb Squad, and Reserve Officer Academy.