Amilah Talukdare, 17, was last seen in the Rothwell area at around 8.15pm on Tuesday, October 29.
Northamptonshire Police said: "We're growing increasingly concerned for Amilah Talukdare who has been missing for several days."
The force have shared an appeal on Twitter asking for retweets.
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Anyone with information about where Amilah might be should contact Northamptonshire Police on 101.