Police are appealing for public help to find teenager Marnie Meyers.
The 15-year-old was last seen on 16 December in the Blackburn area.
Investigators believe Marnie might be frequenting the Ferntree Gully and Boronia areas.
She is described as Caucasian and 165 centimetres tall with brown eyes, long hair and a solid build.
Police released an image of Marnie in the hope someone recognises her.
Anyone who sees Marnie should call Oakleigh Police Station on 9567 8900.