The force say they "really need" assistance in finding 16-year-old Mahad Gouled, who was reported missing on Monday morning (November 27).
Posting to Twitter, they said: "Mahad GOULED age 16yrs #missing from #Brentford, we really need your assistance to find Mahad.
"If you can assist, please call 101 quote ref 17MIS050818. "Thank you".
Anyone with information relating to the whereabouts of the teenager should call Hounslow Police on 101, quoting 17MIS050818 as a reference.
Keep up to date with the latest news in west London via the free getwestlondon app.
You can even set it to receive push notifications for all the breaking news in your area