Arthur T. Porter IV, PC, MBBChir (born in 1956 in Freetown, Sierra Leone) is a Canadian physician. He served as Chair of the Security Intelligence Review Committee of Canada which reviews the activities of the Canadian Security Intelligence Service. He was appointed to the position by Conservative Prime Minister Stephen Harper on September 3, 2008, and along with that appointment, was made a Privy Councillor, giving him the title, "The Honourable".