Police will continue searching the area in southern NSW on Monday after a number of bones were found at about 3.15pm (AEST) on Sunday by a group of trail bike riders.
The bones were found exposed and lying on the ground in an area off a bush track, News Ltd reported.
Belanglo State Forest was the dumping ground used by serial killer Ivan Milat, who buried his victims in shallow graves in the area in the infamous Backpacker Murders.
Police secured a crime scene in the forest and the bones are being examined to establish if they are human.
Police were treating the discovery "as human, until we know better", NSW homicide squad head Detective Superintendent Peter Cotter told The Sydney Morning Herald.
A search of the area was called off on Sunday due to poor lighting.
Forensic detectives will continue searching the forest floor on Monday morning to establish if there are any further remains at the scene.
A police spokeswoman said investigations are continuing.
Milat, one of Australia's worst serial killers, was jailed for life in 1996 for the murders of seven backpackers.
Milat's victims - Deborah Everist and James Gibson of Melbourne, German backpackers Simone Schmidl, Anja Habschied and Gabor Neugebauer, and Britons Joanne Walters and Caroline Clarke - went missing between 1989 and 1992.
Their bodies were found concealed in makeshift graves in the Belanglo State Forest between September 1992 and November 1993.
