The Ferguson P99 was a four-wheel drive Grand Prix car built by Ferguson Research Ltd. It was raced on behalf of the company by the Rob Walker Racing Team. Officially named as Ferguson Climax, it derived its P99 name from its Harry Ferguson Research project number. It used either a 1.5-litre or a 2.5-litre Climax engine. It remains the most famous example of its type as a result of its twin claims to fame: the first AWD car to win a Formula 1 event, and the last front-engined car to win a Formula 1 event.

Harry Ferguson Research Limited was a British company founded by Harry Ferguson who was mostly known as "the father of the modern farm tractor". He was also a pioneer aviator, becoming one of the first to build and fly his own aeroplane in Ireland, and also went on to develop four-wheel drive systems for cars including pioneering their use in Formula One racing cars. The company was based in Siskin Drive, in Coventry, England.