Pattinson, 26, will star in a series of campaigns for the French fashion house's line of men's fragrances, reported E! online.
"Robert likes the brand and the deal is close to USD 12 million for three years," a source said.
Other celebrities who have endorsed Dior fragrances include Jude Law, Charlize Theron and Natalie Portman, who appeared in a controversial topless ad last year.
However, Pattinson is no stranger to the French brand. He has hit the red carpet in several different Dior Homme looks, including a tuxedo at this year's Cannes Film Festival and jeans at the Teen Choice Awards.
