Ally-Ann Brownhill, aged 13, was last seen at her home in North Nowra on Friday 16 August 2024.
Police and family hold concerns for her welfare due to her age.
She is described as being of Caucasian appearance, 150cm-155cm tall, medium build, with orange hair and brown eyes.
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Ally-Ann is known to frequent the Blacktown area.
Anyone with information into her whereabouts is urged to call Nowra Police Station or Crime Stoppers on 1800 333 000.