The Royal Society of Tasmania and the Tasmanian Museum and Art Gallery will today apologise to the state's Aboriginal communities for stealing and mistreating cultural heritage for more than a century.

Apology would be brought by bringing back traditional owners the 14,000 years old ancient rock art out of the museum collection and back to its home at Preminghana in the state's far north west.

The apology hopes to be followed with attitude change and continued consultation with Aboriginal Tasmanians.