Bel Air is a residential neighborhood in the Westside region on the foothills of the Santa Monica Mountains of Los Angeles, California, United States.
Together with Beverly Hills and Holmby Hills, Bel Air forms the Platinum Triangle of Los Angeles neighborhoods. Bel Air, Beverly Hills, and the Los Angeles community of Brentwood are also known as the "three Bs".
Rancho San Vicente y Santa Mónica was a 33,000-acre (130 km) Mexican land grant in present-day Los Angeles County, California, given by governor Juan Alvarado in 1839 to Francisco Sepúlveda II, a soldier and citizen of Los Angeles. The rancho included what are now Santa Monica, Brentwood, Mandeville Canyon, and parts of Bel-Air and West Los Angeles.