The Citroën C4 WRC is a World Rally Car built for the Citroën World Rally Team by Citroën Racing to compete in the World Rally Championship. It is based upon the Citroën C4 road car and replaced the Citroën Xsara WRC. The car was introduced for the 2007 World Rally Championship season and has taken the drivers' title each year since in the hands of Sébastien Loeb, as well as the manufacturers' title in 2008, 2009 and 2010.

A World Rally Car is a racing automobile built to the specific regulations set by the Fédération Internationale de l'Automobile (FIA) and designed for competition in the World Rally Championship (WRC). The cars were introduced in 1997 as a replacement for Group A regulations used in the manufacturers' championship, and were replaced by Group Rally1 in 2022.