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| Company type | Joint venture |
|---|---|
| Industry | Automotive |
| Predecessor | GM Fremont Assembly (1960–1982) |
| Founded | December 1984 |
| Defunct | April 1, 2010 |
| Fate | Dissolved |
| Headquarters | , United States |
| Products | Compact cars and trucks |
Production output | 428,633 vehicles (2006) |
| Services | Automotive manufacturing |
| Owner | General Motors and Toyota |
Number of employees | 5,500 (2006) |
| Website | nummi.com (defunct) |
New United Motor Manufacturing, Inc. (NUMMI) was an American automobile manufacturing company in Fremont, California, jointly owned by General Motors and Toyota that opened in 1984 and closed in April 2010. The plant is located in the East Industrial area of Fremont next to the Mud Slough between Interstate 880 and Interstate 680, the plant's peak production year was 2006, when it manufactured 428,633 vehicles.
After the plant was closed by its owners, the facility was sold to Tesla and reopened in October 2010, becoming known as the Tesla Fremont Factory.