The Tesla Factory is an automobile manufacturing plant in Fremont, California, US, and the principal production facility of Tesla Motors. The facility was formerly known as New United Motor Manufacturing, Inc. (NUMMI), a joint venture between General Motors and Toyota. The plant is located in the East Industrial area of Fremont between Interstates 880 and 680.

NUMMI was established in 1984 by General Motors and Toyota at the site of the defunct Fremont Assembly site. It was a joint venture created to manufacture vehicles which would be sold under both brands. GM pulled out of the venture in June 2009, and several months later Toyota announced plans to pull out by March 2010.

Tesla Motors officially took possession of the site on October 19, 2010, and opened it on October 27. The first retail delivery of the Tesla Model S took place during a special event held at the Tesla Factory on June 22, 2012.