My personal favourites are Anne and Muriel, Les 400 Coups
and Mississippi Mermaid (though i last saw this many years ago). Shoot the Pianist, Jules et Jim, Stolen Kisses, The Wild Child, Day for Night, The Story of Adele H, The Man who Loved Women, The Green Room, Vivement Dimanche not far behind. Many fine films, but relatively few masterpieces, i think.
The Green Room