The police are issuing an urgent appeal to find Mya who is missing from her home in Skipton.
Mya, 14, is described as white, of a medium build, around 5 feet 2” tall with shoulder-length red hair.
She is thought to be wearing ankle-height riding boots, dark grey joggers and a black and grey JCB zip-up hoodie top.
She left her home at 1:15pm on Thursday June 13 and could possibly be in the Shipley area of West Yorkshire.
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A North Yorkshire police spokesperson said: "We’re growing increasingly concerned for Mya’s welfare and asking for anyone who may have seen her, or knows where she is, to contact us immediately.
"Mya if you are reading this, please get in touch with someone, we just want to know that you are safe.
"If you believe you have seen Mya, or have information that could assist police, please contact us as a matter of urgency by calling 101. If you know her immediate whereabouts, please call 999.
"Please quote the North Yorkshire Police reference number 12240104792 when passing on information."
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