A missing 16-year-old boy of Ealing was last seen in Northolt on October 22.
Police are concerned about the whereabouts of William Murphy who may also be using the name William Hutchinson.
William has been described as a white male, 5ft 7ins tall with dark blonde hair, he has blue eyes and suffers from a squint (lazy eyes). He is usually dressed casually in jeans or tracksuits.
The 16-year-old has links to Margate and Ramsgate in Kent where he used to live.
Anyone who has information concerning William’s whereabouts should contact Ealing Police Missing Persons Unit on 101 or Missing People on 116000.