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The Aston Martin One 77 is a British supercar that was produced by Aston Martin from 2009 to 2012. The One 77 was Aston Martin's flagship model, and was the most expensive production car ever made by the company at the time of its launch. It was also the most powerful car ever produced by Aston Martin. The One 77 was developed and designed by a team of engineers and designers led by Ulrich Bez.

The One 77 was based on the Aston Martin V12 Vantage, and shared its platform and engine with that car. The One 77's engine was a 7.3-litre V12 that produced 750 hp and 750 Nm of torque. The engine was mated to a six-speed automatic transmission. The One 77 could accelerate from 0-60 mph in 3.5 seconds, and had a top speed of 220 mph.

The One 77 was built using a mix of traditional and modern construction techniques. The chassis and body were made from carbon fibre and aluminium, while the engine was a traditional petrol engine. The car was designed with aerodynamic efficiency in mind, and featured a number of aerodynamic elements, including a rear diffuser and a front splitter.

The One 77 was originally unveiled as a concept car at the 2007 Geneva Motor Show. The production version of the car was unveiled at the 2009 Geneva Motor Show. A total of 77 cars were produced, with each car costing £1 million.