Waitakere police are appealing for information on the whereabouts of 13-year-old Taila Benfell, who was reported missing three weeks ago.
The young woman was reported missing on May 25 and was last seen at an address in Green Bay, West Auckland.
She has not returned to her caregivers and has not made any contact with friends or family since then, police said.
"We've made a number of enquiries into Taila's whereabouts but as yet we haven't managed to find Taila," Acting Detective Sergeant Scott Armstrong said.
"We want to hear from anyone who might know where she is. She has previously run away but has always been in touch with friends or family after a week or so, and this time no one has heard from her."
Taila has connections throughout Auckland and also in Wellington, police said.
Anyone with information is asked to contact the Waitakere Police on 09 839 0600 or their local police station.
Information can also be given anonymously to the organisation Crimestoppers on 0800 555 111.