Carter Price, has been missing since May 17.
Carter is described as 5ft 7, thin, with short dark brown hair, and wearing a tracksuit and Nike trainers.
He is from and believed to be in the Gainsborough area.
A police spokesman: "If you know where Carter is, please call 101 or email [email protected] incident 384 of 17/05."
Alternatively, contact the missing persons charity on 116 000 or by emailing [email protected]