The teenager was last in contact with his family in Hamilton on 13 May, and his current whereabouts is unknown.
Police said he may be in the Waikato or Counties Manukau area.
He is 1.5m tall and has short dark hair. He was last seen wearing long black shorts, a grey jersey, and black puffer vest, with a black satchel.
Police are asking anyone with information to call 105.