Ethan Dunmall is last known to have been in the Lodge Oak Lane area at around 1pm on Thursday 13 May 2021.
The 16-year-old is described as being around five feet and nine inches tall, of slim build and with short blond hair.
When he was last seen, Ethan was wearing a red jumper and blue trousers. He is also believed to frequent Tunbridge Wells.
Inspector Pat Griffiths said: ‘We are concerned for Ethan’s welfare and are urging anybody who sees him or knows where he might be to contact us.’
Anyone with information is asked to call Kent Police on 999 quoting 13-0636.