The multiple Champ Car title winner, Frenchman and former F3000 champion will replace Vitantonio Liuzzi, and be Sebastian Vettel's teammate.
"It has been a long time coming, but here we are," Bourdais, who at the age of 28 recently said his grand prix foray must begin "now or never", was quoted as saying in a statement provided by the team.
He also thanked his current Champ Car team, series leader Newman/Haas/Lanigan Racing, for "letting me pursue my dream and allowing me to test for Scuderia Toro Rosso a few times this year". (GMM)