The Aston Martin DBR4/250, commonly referred to simply as the DBR4, is a Formula One racing car, designed by Ted Cutting for the sports car manufacturer Aston Martin. Following notable successes in sports car racing during the mid- to late-1950s — culminating in winning the 24 Hours of Le Mans endurance race and the World Sportscar Championship title in 1959 — the DBR4 was intended to repeat this success in the highest tier of open-wheel racing.

The DBR4 was largely based on the DB3S sportscar, and borrowed that vehicle's basic chassis and engine layout. Although it was tested as early as 1957, the DBR4 did not make its World Championship debut until the 1959 Dutch Grand Prix, driven by Roy Salvadori and Carroll Shelby. However, its long gestation period meant that by the time it finally entered competition much of its concept and technology had been superseded, and the car was not a success. The DBR4 was replaced by the lighter Aston Martin DBR5/250 in early 1960, but when that car also failed to provide competitive results Aston Martin abandoned Formula One to concentrate on their more successful sports car projects.

A potential open-wheeled Aston Martin racing car had been discussed as early as 1955, and a hastily constructed prototype was tested in the Australian and New Zealand races in early 1956, driven by Reg Parnell. Following successes in this Antipodean experiment, and despite the majority of Aston's racing department being fully occupied with the sports car program, Aston Martin decided to pursue a Formula One entry in earnest. However, the company's emphasis on sports car competitions meant that attention was often diverted from the Formula One program, and development delays were common almost from the outset.

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