Thousand Oaks is a city in southeastern Ventura County, California, United States. It is in the northwestern part of the Greater Los Angeles Area, approximately 35 miles (56 km) from Downtown Los Angeles and is less than 15 mi (24 km) from the Los Angeles city neighborhood of Woodland Hills. It was named after the many oak trees that grow in the area, and the city seal is adorned with an oak.

The city forms the populated core of the Conejo Valley, which includes Thousand Oaks proper, Newbury Park, Westlake Village, Agoura Hills, and Oak Park. The Los Angeles County–Ventura County line crosses at the city's eastern border with Westlake Village. The population was estimated to be 129,339 in 2015, up from 126,683 at the 2010 census.

Thousand Oaks and Newbury Park were part of a master-planned city, created by the Janss Investment Company in the mid-1950s. It included about 1,000 custom home lots, 2,000 single-family residences, a regional shopping center, a 200-acre (0.81 km²) industrial park and several neighborhood shopping centers. The median home price is around $669,500. Thousand Oaks was ranked the fourth-safest among cities with a population greater than 100,000 in the United States by the FBI's 2013 Uniform Crime Reports.

The area was once occupied by the Chumash people, and 2000-year-old cave drawings may still be seen at the Chumash Indian Museum, 3290 Lang Ranch Parkway, in the Lang Ranch section of the city. The Chumash village was known as Sap'wi, which means "House of the Deer".

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