Clovis Cornillac was born to actors Myriam Boyer and Roger Cornillac. He started studying theatre at the age of 14.

He made his debut in cinema in 1984 in Robin Davis's Outlaws. He was noticed by Dominique Besnehard, who introduced him to Peter Brook at the Théâtre des Bouffes du Nord. Cornillac performed in Brook's stage adaptation of Le Mahâbharata.

Cornillac was married to Caroline Proust from 1994 to 2010, with whom he had twin daughters. He married actress Lilou Fogli in 2013, with whom he has a son, Nino, born in 2013.

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