The Williams FW15C is a Renault-powered Formula One car designed by Adrian Newey and built by Williams Grand Prix Engineering. It was raced by Alain Prost and Damon Hill during the 1993 Formula One season.
As the car that won both the drivers' and Constructors' Championships in the last season before the FIA banned electronic driver aids, the FW15C (along with its racing predecessor FW14B) was, in 2005, considered to be the most technologically sophisticated Formula One cars of all time, incorporating anti-lock brakes, traction control, active suspension, and a semi-automatic and fully-automatic gearbox.
The original FW15 was a new car designed in 1992 to incorporate the active suspension changes developed and implemented on the earlier FW14B. The FW14B had initially been designed as a passive car (FW14) and had been pushed into being active. This meant it had various new active components implemented on the car which had not been in the original design brief. It was therefore considered a relatively overweight package. The original FW15 was an active car from the start which enabled a much tidier package closer to the minimum weight limit. The success of the FW14B meant that the FW15 was not needed in 1992.
The FW15B was a 1992 FW15 hastily converted to the 1993 regulations featuring narrower front suspension, narrower rear tyres, raised nose and wing endplates, and narrower wings to enable early season testing for 1993.