Benoît is the eldest of three siblings; he has a younger brother called Arnaud and they have a younger sister. She is 10 years younger than Benoît.
Met long-term companion Nikita Samaha on the set of Crimson Rivers 2: Angels of the Apocalypse (2004).
He read the casting advert for Life Is a Long Quiet River (1988) in the newspaper "Libération".
His companion for several years was French actress Juliette Binoche (1999-2003).
He met Juliette Binoche filming The Children of the Century (1999) in 1999.