Emily Durkin was reporting missing shortly before 5pm on Monday 13 December 2021 and officers are concerned for her welfare.
The 13-year-old is believed to have last been seen near Paddock Wood railway station at around 4pm and may have since travelled to London.
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She is described as around five feet, two inches tall, with light brown hair in a ponytail and brown eyes.
She is believed to have been wearing school uniform, a black coat with a fur-lined hood and was carrying a Michael Kors bag when last seen.
Anyone who has seen her or knows of her whereabouts should call 101, quoting reference 13-0977.