After obtaining a degree as a dental surgeon (which he never put into practice), Carlos Chahine discovered theater in Paris with Vera Gregh, who encouraged him to begin acting. Thus, he took courses at ENSAD (école nationale d’art dramatique) in TNS (théâtre national de Strasbourg) with group 23, from 1985 to 1988. After having worked exclusively in France and in Europe with many directors, such as Michel Vinaver, Matthias Langhoff, Sylviu Purcarete, Alain Françon, René Loyon, Viviane Théophilidès, Stuart Seide, Philippe Van Kessel, Christian Rist, etc., he made a comeback to Lebanon thanks to Ghassan Salhab, with whom he made two films.
In 2008, he wrote, directed and acted in his first short film, The North Road. The film received many international awards, including Best Narrative Short Award at the Tribeca Film Festival in 2009.