Thomas John Augustus Griffin (27 July 1832 – 1 June 1868) was an Australian police officer and gold commissioner who was executed in 1868, after being found guilty of the double murder of two fellow police officers, Constable John Francis Power and Constable Patrick William Cahill. In a notorious case of grave robbery, Griffin's grave was illegally exhumed more than a week after his execution, and his body deliberately decapitated and his head stolen.