Police are looking for the family of the girl who was discovered stoned to death in the veld in Kagiso on the West Rand on Saturday night.
The half-naked body of the teenager was discovered in an open field in Swanieville.
West Rand police spokesman Inspector Solomon Sibiya said: "Detectives were in the area on an operation when a member of the community informed them about the body in an open veld in Swanieville."
Police believe that the teenager is aged between 14 and 18 and might have been raped before she was stoned. She had sustained a head injury.
Sibiya said: "The girl was half-naked; she was only wearing a denim top. Her short denim pants and black leggings were found a few metres from the scene.
"Her body was taken to the Roodepoort mortuary and members of the community who have a family member missing can go there to identify her."