Guillaume Gallienne (born 8 February 1972) is French actor and film director who has been a member (Sociétaire) of the Comédie-Française company from 1998. He made his film debut 1992 in Tableau d'honneur and he has starred in Marie Antoinette by Sofia Coppola. His 2013 film Me, Myself and Mum was screened in the Directors' Fortnight section at the 2013 Cannes Film Festival where it won the top prize (Art Cinema Award) and the Prix SACD.