Police are appealing for information about the whereabouts of a teenager from Abbey Wood.
Demi Collins, aged 16, was last seen on August 20 at around 11am.
Last time she was seen, she was wearing black leggings, an orange Lacoste top, black leather jacket and black trainers.
She has connections with the Woolwich area.
Her family and police are concerned for her welfare as she left without her phone, money or her Oyster card.
Anyone with information should call police on 101, quoting reference 14MIS029706.