The Citroën C6 is an executive car produced by the French car maker Citroën from 2005 to 2012. The Citroën C6 was inspired by the Citroën C6 Lignage concept car with a fastback saloon like styling.

Inspired by the Citroën C6 Lignage prototype, which was first shown at the Geneva Motor Show in the spring of 1999, but differs from the concept car’s styling in minor details (like not having rear suicide doors for easy access). The C6 was intended as a replacement for the XM, and Citroën was intent on launching it before the end of 2000.

The Citroën C6 Lignage formed the basis of the Citroën C6, which was launched in November 2005, five years later than Citroën had originally planned. The XM ceased production in June 2000, and the first C6 rolled off the production line almost five years later.

The C6 has a fastback saloon profile which is due in part to the concave rear window, similar to the Citroën CX and some models of Dodge in the 60s. However, the C6 is a conventional saloon with a classic trunk, and not a hatchback like its XM predecessor.

The C6 was aimed as a stylish alternative to executive cars, like the BMW 5 Series and the Audi A6, and it has been described as “spaceship that rides on air”, “charmingly idiosyncratic” and “refreshingly different”.

Citroën hoped that the C6’s selling points would be its innovative technology, which includes a head-up display, a lane departure warning system, xenon directional headlamps (also available on the Citroën C4 and Citroën C5), Hydractive 3+ suspension with electronically controlled springing and damping, and a rear spoiler which automatically adjusts to speed and braking.