Austrian Alexander Wurz will race alongside Nico Rosberg at the Williams team next season, the British squad have announced.
The news mean Australian Mark Webber will leave the team at the end of the season.
Webber's future with the team was uncertain after Williams decided not to take up an option which expired last Monday to keep the Australian driver for next season.
Wurz was the team's test driver this season, after moving there from McLaren, where he was a test driver from 2001 to 2005.
The 32-year old last completed a full Formula One season in 2000 with the Benetton team.