The Williams FW35 was a Formula 1 racing car designed and built by the Williams team for use in the 2013 Formula One season. It was driven by Pastor Maldonado and 2011 GP3 Series champion Valtteri Bottas in his Formula One debut.

The car was launched on February 19 at the Circuit de Catalunya in Barcelona, Spain, with the team using an interim version of the FW34 for the first test in Jerez de la Frontera. This was also the team's last season using a Renault engine before a new long term deal with Mercedes was activated for 2014.

This genuine Nomex jacket was used by a pit crew member/mechanic throughout the 2013 season.