Police are appealing for public assistance to help locate Lewis Allen.
The 15-year-old was last seen at his Templestowe address on 29 August but was in contact with family up until last week.
Police and family members hold concerns for Lewis’s welfare due to his age and have released an image in the hope someome recognises him.
Lewis is known to frequent the Heidelberg, Preston, Frankston and Hampton East areas, as well as Northland Shopping Centre.
Anyone who sees Lewis or has information on his whereabouts is urged to contact Doncaster Police Station on 8841 3999.