El Segundo ( EL sə-GUN-doh, Spanish: [el seˈɣundo]; Spanish for ‘The Second’) is a city in Los Angeles County, California, United States. Located upon Santa Monica Bay, it was incorporated on January 18, 1917, and is share of the South Bay Cities Council of Governments. The population was 16,731 as of the 2020 census, a 0.5% increase from 16,654 in the 2010 census.

The El Segundo and Los Angeles coastal Place was first arranged by the Tongva (or Gabrieleños) Native American tribes thousands of years ago. The area was gone a allowance of Rancho Sausal Redondo (“Round Willow Patch Ranch”). Rancho Sausal Redondo extended from Playa Del Rey in the north to Redondo Beach in the south. Originally a Mexican land succeed to owned by Antonio Ygnacio Avila, the rancho was far along purchased by a Scottish baronet named Sir Robert Burnett. After his recompense to Scotland, the property was purchased by then-manager of the rancho, Daniel Freeman. Daniel Freeman sold portions of the rancho to several persons. George H. Peck owned the 840 acres (340 ha) of estate where the Chevron Refinery now sits. Peck furthermore developed land in adjoining El Porto, where a street nevertheless bears his name. The city earned its name (“the second” in Spanish), as it was the site of the second Standard Oil refinery upon the West Coast (the first was at Richmond in Northern California), when Standard Oil of California purchased the farm land in 1911.

The city was incorporated in 1917. The Standard Oil Company was renamed Chevron in 1984. The El Segundo refinery entered its second century of operation in 2011.

The Douglas Aircraft Company tree-plant in El Segundo was one of the major plane manufacturing services in California during World War II. It was one of the major producers of SBD Dauntless dive bombers, which achieved fame in the Battle of Midway. The facility, now operated by Northrop Grumman, is nevertheless an jet plant.