The CD SP266 was a prototype sports car that was used during 1966 and 1967 in sports car races.

After his separation from René Bonnet, Charles German founded a private car company in 1962. The company named SECA CD focused on the development of sports cars in small numbers. The beginning of the 1960s, were equipped with Panhard engines and in 1966 a vehicle was developed and fitted with a Peugeot engine. German also left with the vehicle designer and aerodynamicist Robert Choulet.

The CD SP66 had an extremely aerodynamic, round shape, with two tail fins and covered rear wheel arches. Although the car had a 1.2-litre 4-cylinder engine from Peugeot (a rather weak displacement), the car reached almost 300 km/h in a straight line.

The car made its debut at the 24-hour race at Le Mans in 1966. There were three SP66s at the start of the race but none managed to finish the race.