Dennis Bruce Allen (7 November 1951 – 13 April 1987) was an Australian drug dealer who was reported to have murdered many victims. He was based in Melbourne, and was the oldest son of criminal matriarch Kath Pettingill. Allen, whose solicitor was Andrew Fraser, avoided jail by having info on the corrupt Victorian police at the time. He died of heart disease in 1987 in prison custody awaiting trial for murder.