Ensign was a Formula One constructor from Britain. They participated in 133 grands prix, entering a total of 155 cars. Ensign scored 19 championship points and no podium finishes. The best result was a 4th place at the 1981 Brazilian Grand Prix by Marc Surer, who also took fastest lap of the race.

The 1981 Brazilian Grand Prix was the second race of the 1981 Formula One World Championship and was held on 29 March 1981 at Jacarepaguá in Rio de Janeiro, Brazil. Formula One moved to the Jacarepaguá circuit in Rio de Janeiro from the Interlagos circuit in São Paulo, after safety concerns with the long Interlagos circuit and the growing slums of São Paulo being at odds with the glamorous image of Formula One.