The Aston Martin DB4 is a British grand touring car produced between 1958 and 1963, widely regarded as the model that established the modern template for the Aston Martin road car. It was built on an aluminium platform developed with coachbuilder Touring of Milan, using a Superleggera body construction method that prioritised lightweight rigidity, and it introduced a twin-cam 3.7-litre inline-six engine designed by Tadek Marek. Over its production run the DB4 was progressively developed through five series, with incremental changes to the bodywork, engine tune, and interior. Notable variants include the DB4 GT, a shorter, lighter, and more powerful version built for competition use, and the DB4 GT Zagato, a further-lightened collaboration with the Italian coachbuilder Zagato that remains one of the most valuable and recognisable British cars ever produced.