The International Force East Timor (INTERFET) was a multinational non-United Nations peacemaking task force, organised and led by Australia in accordance with United Nations resolutions to address the humanitarian and security crisis that took place in East Timor from 1999–2000 until the arrival of UN peacekeepers. INTERFET was commanded by an Australian military officer, Major General Peter Cosgrove.

The Indonesian invasion of East Timor, known in Indonesia as Operation Lotus, began on 7 December 1975 when the Indonesian military (ABRI/TNI) invaded East Timor under the pretext of anti-colonialism and anti-communism to overthrow the Fretilin regime that had emerged in 1974. The overthrow of the popular and short-lived Fretilin-led government sparked a violent quarter-century occupation in which approximately 100,000–180,000 soldiers and civilians are estimated to have been killed or starved to death. The Commission for Reception, Truth and Reconciliation in East Timor documented a minimum estimate of 102,000 conflict-related deaths in East Timor throughout the entire period from 1974 to 1999, including 18,600 violent killings and 84,200 deaths from disease and starvation; Indonesian forces and their auxiliaries combined were responsible for 70% of the killings.