Campbell /ˈkæmbəl/ is a city in Santa Clara County, California, and part of Silicon Valley, in the San Francisco Bay Area. As of the 2010 U.S. Census, Campbell's population is 39,349. Although not a major high-tech city like many of its neighbors, Campbell is the original home of eBay and of its creator, Pierre Omidyar.

Campbell is home to the Pruneyard Shopping Center, a sprawling open-air retail complex which was involved in a famous U.S. Supreme Court case that established the extent of the right to free speech in California. Today the Pruneyard Shopping Center is home to the South Bay offices of the Federal Bureau of Investigation.

Campbell is bordered on the east and north by San Jose, on the south by Los Gatos, and on the west by a small portion of Saratoga.

According to the United States Census Bureau, the city has a total area of 5.9 square miles (15 km²). 5.8 square miles (15 km²) of it is land and 0.1 square miles (0.26 km²) of it is water.

Of the total area, 1.49% is water, consisting of percolation ponds in Los Gatos Creek Park and in other locations; San Tomas Aquino Creek, which flows north on the west side of the city, is completely enclosed with fences and runs through concrete culverts; and Los Gatos Creek, which flows north-north-east on the east side of the city and has paths along both banks for hikers and joggers (locally called the "Perc Ponds").

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