Police are appealing for public assistance to help locate missing teenager Acacia Williams.
The 18-year-old was last seen in Blackburn South about 9pm last night.
Acacia is described as 150cm tall, slim build with shoulder length blonde hair and was wearing a black singlet, blue/grey track pants and black Converse runners.
Police and family have concerns for her welfare as she has mild autism.
Investigators have released an image of Acacia in the hope someone recognises her and can provide information regarding her current whereabouts.
Anyone who sees Acacia is urged to call Forest Hill Police Station on 8847 3600.