Livermore (formerly Livermores, Livermore Ranch, and Nottingham) is a city in Alameda County, California, in the United States. With an estimated 2017 population of 89,648, Livermore is the most populous city in the Tri-Valley. Livermore is located on the eastern edge of California's San Francisco Bay Area. The incumbent Mayor of Livermore is Amanda Wallach.

Livermore was founded by William Mendenhall and named after Robert Livermore, his friend and a local rancher who settled in the area in the 1840s. Livermore is the home of the Lawrence Livermore National Laboratory, for which the chemical element livermorium is named (and thus, placing the city's name in the periodic table). Livermore is also the California site of Sandia National Laboratories, which is headquartered in Albuquerque, New Mexico. Its south side is home to local vineyards. The city has redeveloped its downtown district and is considered part of the Tri-Valley area, comprising Amador, Livermore and San Ramon valleys.

Before its incorporation in 1796 under the Franciscan Mission San Jose, located in what is now the southern part of Fremont, the Livermore area was home to some of the Ohlone (or Costanoan) native people. Each mission had two to three friars and a contingent of up to five soldiers to help keep order in the mission and to help control the natives. Like most indigenous people in California, the natives in the vicinity of Mission San Jose were mostly coerced into joining it, where they were taught Spanish, the Catholic religion, singing, construction, agricultural trades and herding—the Native Californian people originally had no agriculture and no domestic animals except dogs. Other tribes were coerced into other adjacent missions. The Mission Indians were restricted to the mission grounds where they lived in sexually segregated "barracks" that they built themselves with padre instruction. The population of all California missions plunged steeply as new diseases ravaged the Mission Indian populations—they had almost no immunity to these "new to them" diseases, and death rates over 50% were not uncommon.

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