The Daimler DS420, also known as the Daimler Limousine, is a limousine made by The Daimler Company Limited between 1968 and 1992. The car was designed for official use and it was popular with chauffeur services, hoteliers and undertakers. It was used as an official state car in many countries. No other limousine model has been delivered to more reigning monarchs than the DS420, and the car is still used by the royal houses of the United Kingdom, Sweden, Denmark, and Luxembourg.

The Daimler Company was purchased by Jaguar Cars in 1960, which itself was bought by the British Motor Corporation (BMC) in 1966 and became part of the larger British Leyland conglomerate in 1968. BMC and Jaguar each had their own limousines before merging operations: the Vanden Plas Princess and the Daimler DR450, respectively. Rather than build two competing products, they decided to consolidate limousine production to a single model under the Daimler marque. Most of the engineering of the DS420 would be carried out by Jaguar. The DS420 was built on the floorpan of Jaguar's 420G flagship model with the Jaguar wheelbase extended 533 mm. 

In comparison to a Rolls-Royce Phantom VI, the DS420's wheelbase was 10 cm shorter, its body 30 cm shorter, it was approximately 350 kilograms lighter, and its engine had only about two-thirds the displacement of the Rolls-Royce V8. As such, the Daimler was less expensive than a Rolls-Royce, less than half the price of a standard long-wheelbase (Silver Wraith) Rolls-Royce Silver Shadow.

With a maximum top speed of 177 km/h, a curb weight of 2140 kgs, the Daimler DS 420 Limousine has a naturally-aspirated - 6 cylinder engine, Petrol motor. This engine produces a maximum power of 165 PS.