Police are appealing for public assistance to help locate missing 18-year-old Hayley Brittain.
Hayley was last seen on 21 September at a library in Stuart Street, Dandenong about 1pm.
Police have concerns for her welfare due to the length of time she has been missing.
Hayley is about 150cm tall with a slim build, black hair and hazel eyes.
She was last seen wearing jeans, a black and grey polo jumper and black knee length boots.
She is known to frequent the Dandenong, Elwood, St Kilda and Mildura areas.
Police have released an image of Hayley in the hope someone recognises her and can provide information regarding her current whereabouts.
Anyone with information about Hayley is asked to contact Dandenong Police Station on 9767 7444.