Paul Thomas O'Sullivan, is an Australian diplomat and public servant who served as Australia's High Commissioner to New Zealand and as former Director-General of Security. O'Sullivan accepted a role as a political advisor for the Abbott government in 2013.

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).