Malcolm Sayer (21 May 1916 – 22 April 1970) was an aircraft engineer during wartime and later automotive aerodynamist. His most notable aerodynamic work being partly responsible for the engineering body development of the E-Type Jaguar and early style guidelines for Jaguar XJS. He spent the last twenty years of his life working at Jaguar Cars and was one of the first engineers to apply principles of aircraft streamline aero function to cars.