Berkeley (/ˈbɜrkliː/ burk-lee) is a city on the east shore of San Francisco Bay in northern Alameda CountyCaliforniaUnited States. It is named after the Irish eighteenth-century bishop and philosopher George Berkeley. It borders the cities of Oakland and Emeryville to the south and the city of Albany and unincorporated community of Kensington to the north. Its eastern border with Contra Costa County generally follows the ridge of the Berkeley Hills. Its population at the 2010 census was 112,580.

Berkeley is the site of the oldest campus in the University of California system – the University of California, Berkeley – of the Lawrence Berkeley National Laboratory which is managed and operated by the university, and the Graduate Theological Union. It is one of the most politically liberal cities in the United States.