Sir Geoffrey Sandford Reed, KC was a justice of the Supreme Court of South Australia and the first Director-General of Security and head of the Australian Security Intelligence Organisation (ASIO).

The Australian Security Intelligence Organisation is Australia's national security agency responsible for the protection of the country and its citizens from espionage, sabotage, acts of foreign interference, politically motivated violence, attacks on the Australian defence system, and terrorism. ASIO is part of the Australian Intelligence Community and is comparable to the FBI (US) and MI5 (UK).