Paul Thomas O'Sullivan AO, CNZM (born 3 February 1948)[1] 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 attended Marcellin College, Randwick,[2] and graduated from the University of Sydney with a Bachelor of Arts (Hons).

After joining the Department of Foreign Affairs in 1971, O'Sullivan held diplomatic appointments in Rome, Washington, D.C. and Cairo.

[13] According to evidence presented, in March 2006, to the Cole Inquiry, an Australian Royal Commission into the "oil for food" scandal, in June 2005 while serving as senior international advisor to the Prime Minister, O'Sullivan advised executives of the Australian Wheat Board (AWB) against full co-operation with a United Nations inquiry into allegations that the AWB had breached UN sanctions by paying kickbacks to the regime of former Iraqi dictator Sadaam Hussein.

Notes tendered to the Cole Inquiry showed that O'Sullivan told AWB executives to "[k]eep your responses narrow [and] technical.