The Opel Signum is a large family car that was engineered and manufactured by the German automaker Opel from 2003 to 2008. It was almost exclusively sold in Europe. In the United Kingdom, it was rebadged and sold under the Vauxhall Signum name. The Opel Signum was largely based on the Opel Vectra, and used the long-wheelbase version of the GM Epsilon platform, also used by the Opel Vectra Caravan.
The car was based on an unusual concept of a very large hatchback with a nearly vertical tailgate. Its dimensions place it between traditional large family cars and executive cars. In most markets, it was also priced accordingly (more expensive than the Opel Vectra, but less than e.g. Audi A6). The Opel Signum was intended to capture a whole new market segment.
From March 2008, the Vauxhall Signum was no longer listed on Vauxhall's current price list, which implied that RHD production ended, and both the Opel Signum and the Opel Vectra were replaced in October 2008 by the Opel Insignia range.