Scott Diver (16) of Second Avenue, Clydebank vanished from his home at 2.45pm hrs on Saturday, September 17.
He is described as white, 5ft 10, slim build with brown eyes and dark hair. When last seen he was wearing a navy blue Adidas tracksuit with light blue stripes down the arms and legs, a white t-shirt and navy blue Adidas training shoes with grey stripes.
Inspector John McMillan at Clydebank said: “Scott’s family is very anxious to hear from him as this is completely out of character to be gone for so long.
“I urge anyone who has seen Scott since Saturday afternoon or anyone who knows of his present whereabouts to contact Clydebank Police immediately via 101.”