Leoni Priestly, 14, was reported missing by the force on Monday afternoon (October 23) and police in Hounslow are searching for the teenager as she has links to the borough.
Posting to Twitter, the force said: "Leoni Priestly, 14 who is #Missing from #Surrey.
"Can you help us find her as she has links to the Borough.
"Call 101 or @MetCC ref 17MIS046393"
Anyone who may have information relating to the whereabouts of Leoni should contact police by calling 101, stating 17MIS046393 as a reference.
Keep up to date with the latest news in west London via the free getwestlondon app.
You can set up your app to see all the latest news and events from your area, plus receive push notifications for breaking news.