Clive Owen Gestern Williams, MG (born 1 March 1945)[1] is a British-born former Australian Army Military Intelligence officer, and academic with research interests in terrorism and counterterrorism, politically motivated violence, insurgency and counterinsurgency.

After leaving the Army, Williams pursued a civilian career in Australian Defence Intelligence, working mainly on transnational issues.

He left Defence in 2002 Clive Williams has worked and lectured internationally on terrorism-related issues since 1980, and started running terrorism courses at the Australian National University (ANU) in 1996.

Since leaving Defence in 2002, Williams has run terrorism and national security-related Masters course electives at the ANU and a number of Australian and overseas universities.

He regularly conducts field work in his areas of research interest, including Afghanistan.