Police are appealing for help to find 15-year-old girl Holly Feltham.
She was last seen in Frankston at 5pm on Saturday 22 July, and is known to frequent Dandenong, Narre Warren and Endeavour Hills.
Police are concerned for her welfare due to her age and the length of time she has been missing.
Holly is 155 centimetres tall with a slim build, medium-length black hair and blue eyes.
She was wearing black leggings, a dark jacket and white Nike sneakers.
Call St Kilda police station on 9536 2666 with any information.