Aaliyah Ekedi-Morrow, 14, was reported missing from Ladbroke Grove last Wednesday (June 11).
She is known to visit the Dollis Hill area, the Metropolitan Police said.
At the time she went missing, she was last seen at 2.35pm wearing her school uniform – which includes a black blazer, a white shirt, a black shirt and a black and pink stripped tie.
She is of slim build and has light brown hair that she often wears in a bun.
Detective Inspector William Peel, from the Central West’s missing people team: “Due to Aaliyah’s age and the period of time she has been away from home we remain very concerned for her wellbeing.
“I urge anyone including Aaliyah’s friends and family, who may have seen her or have information concerning her safety and whereabouts to please get in touch with police as soon as possible.”
Anyone with information is asked to call police on 101 or message @MetCC on X quoting 8071/11JUNE or contact the Missing People charity on 116 000.