Police are appealing for public assistance to help locate sisters Ritia (Tia) and Tamokai (Tamika) Rikiti.
The 13-year-old and 15-year-old were last seen at their Deer Park address on 19 July.
Police and family members hold concerns for Tia and Tamika’s welfare due to their age and the length of time they has been missing.
Police have released images of the sisters in the hope someone recognises them and can provide information on their whereabouts.
The sisters are known to frequent Sunshine and Sunshine West areas.
Anyone who sees Tia and Tamika or has information on their whereabouts is urged to contact Sunshine Police Station on 9313 3333.