The Williams FW40 was a Formula 1 racing car designed by Williams to compete in the 2017 Formula 1 season. The car was predominantly driven by Felipe Massa and Lance Stroll, who made his Formula 1 début with the team. The FW40 was the first Williams F1 car featured with a shark fin since the FW32 in 2010.

The number '40' in the chassis name signified the 40th anniversary of the team. In addition, it was the last F1 car Massa drove in his career, as he announced his retirement for a second time in November.

This genuine Nomex jacket was used by a pit crew member/mechanic throughout the 2017 season.