The Citroën C5 is a large family car produced by the French manufacturer Citroën since March 2001, currently at its third generation. It replaced the Citroën Xantia, in the large family car class, and is the first modern Citroën with "Cx" naming nomenclature, previously used by its ancestors, the C4 and C6 from 1930. A crossover, unrelated to the previous generations, was released in 2021, with crossover styling and marketed as the Citroën C5 X.

The D-segment is the 4th category of the European segments for passenger cars, and is described as "large cars".