The Citroën Prototype C was a range of vehicles created by Citroën from 1955 to 1956 under the direction of André Lefèbvre. The idea was to produce a water drop-shaped, very lightweight vehicle, which would be more modern and smaller than the 2CV. One of the prototypes, the Citroën C-10 has survived and is still owned by Citroën.
The overall look of the vehicle was quite similar to the Messerschmittbubble car. It was equipped with the same 425 cc engine as the 2CV.
The vehicle was also nicknamed Citroën Coccinelle (Ladybird in French).