Mission San José is a Spanish mission located in the present-day city of Fremont, California, United States. It was founded on June 11, 1797, by the Franciscan order and was the fourteenth Spanish mission established in California. The mission is the namesake of the Mission San José district of Fremont, which was an independent town subsumed into the city when it was incorporated in 1957. The Mission entered a long period of gradual decline after Mexican secularization act of 1833. After suffering decline, neglect and earthquakes most of the mission was in ruins. Restoration efforts in the intervening periods have reconstructed many of the original structures. The old mission church remains in use as a chapel of Saint Joseph Catholic Church, a parish of the Diocese of Oakland. The museum also features a visitor center, museum, and slide show telling the history of the mission.

Fremont is a city in Alameda County, California, United States. Located in the East Bay region of the Bay Area, Fremont has a population of 230,504 as of 2020, making it the fourth most populous city in the Bay Area, behind San Jose, San Francisco, and Oakland. It is the closest East Bay city to the high-tech Silicon Valley network of businesses, and has a strong tech industry presence.