Milpitas is a city in Santa Clara County, California, in Silicon Valley. As of the 2020 census, the city population was 80,273. The city's origins lie in Rancho Milpitas, granted to Californio ranchero José María Alviso in 1835.

Milpitas incorporated in 1954 and has since become home to numerous high tech companies, as part of Silicon Valley.

Milpitas was first inhabited by Tamien people, a subgroup of the Ohlone people who had resided in the San Francisco Bay Area for thousands of years. The Ohlone Indians lived a traditional life based on everyday hunting and gathering. Some of the Ohlone lived in various villages within what is now Milpitas, including sites underneath what are now the Calvary Assembly of God Church and Higuera Adobe Park. Archaeological evidence gathered from Ohlone graves at the Elmwood Correctional Facility in 1993 revealed a rich trade with other tribes from Sacramento to Monterey.

Milpitas is divided into three sections by Interstates 680 and 880. To the west of I-880 is a largely industrial and commercial area. Between I-880 and its eastern counterpart freeway, I-680, is an industrial zone in the south and residential neighborhoods in the north. Other residential neighborhoods and undeveloped mountains lie east of I-680.