The Williams FW28 was the car with which the Williams team competed in the 2006 Formula One season. The drivers were Mark Webber and rookie Nico Rosberg, the reigning GP2 Series champion. Webber was in his second year with the team, and teammate Nico Rosberg carried a hint of nostalgia, as Nico's father Keke had won the 1982 F1 championship in a Cosworth-engined Williams.

This was the first V8-powered Williams car since the FW12 in 1988 and also the first Williams car ran on Bridgestone tyres since the FW22 in 2000.