Longueuil police are searching for 14-year-old Olek Basak, who was last seen Thursday morning leaving his home in the borough of Saint-Hubert.
Olek, who is white, is five feet nine inches, has curly brown hair and brown eyes, and weighs about 130 pounds.
He speaks French and was wearing a black polo shirt and red skateboarding shoes last time he was seen. Olek wears eyeglasses with blue frames.
Police say he could be in a nearby park. They are asking people to call 911 if they see him.