Quebec provincial police are asking for the public's help in finding 16-year-old Darren Raphaël-Fontaine.
Raphaël-Fontaine was last seen in Chicoutimi on Aug. 18, in Quebec's Saguenay region.
The teen is from Roberval, on the western edge of Lac St-Jean.
Police said his family is concerned for his safety.
He is described as measuring five-feet-eight-inches tall (1.73 metres) and 142 pounds (64 kilograms), with black hair and brown eyes.
Anyone with information is asked to call the SQ's tip line at 1-800-659-4264.