Daimler Double-Six may refer to either of two different series of Daimler V12 engines or to a car produced by Jaguar Cars under the Daimler nameplate.
Engines made 1926 to 1938
Daimler Double-Six Engine 7.1-litre sleeve-valve (1926–1930) 3.7-litre sleeve-valve (1927–193?) 5.3-litre sleeve-valve (1930–1936) 6.5-litre sleeve-valve (1930–1936) 6.5-litre poppet valve (1937)
Engines made 1972 to 1997
Daimler Double-Six Engine 5.3-litre (1972–1981) 5.3-litre HE (1981–1992) 6.0-litre HE (1993–1997)
Cars
Daimler Double-Six (1972–1992) Daimler Double-Six XJ81 (1993–1994) Daimler Double-Six X305 (1994–1997)