1969 film written and directed by
Francois Truffaut based of the true story of the
wild boy of Aveyron (
dmd's writeup on the subject is cool), a child who was found living
feral in the woods of
France around the end of the 18th century. Truffaut himself plays a doctor who works to educate the child, who is unable to speak, and most of the film focuses on the interaction between Truffaut's character, Dr. Itard, and the child.
In French, the title is L'enfant sauvage.