Australia's history with politically motivated violence and terrorism spans several decades, encompassing a wide range of incidents targeting political figures, diplomatic missions, and ethnic communities. Recent attacks, such as the assault on independent MP Helen Haines, have drawn attention to this long and complex past.

Between 1966 and 2009, more than 200 terrorist incidents and threats were documented, many motivated by nationalist, ethnic, or political objectives. Early examples include the 1966 shooting of federal opposition leader Arthur Calwell and the 1978 bombing of Sydney’s Hilton Hotel, which killed three people and injured several others during an international summit.

Throughout the late 1960s and 1970s, tensions related to conflicts overseas manifested violently in Australia. Croatian nationalist groups engaged in bombings of Serbian Orthodox churches and Yugoslav government targets in multiple cities, while in 1972, letter bombs linked to the Black September Organisation were intercepted or detonated against Israeli diplomats and Australian officials. The same decade saw the mafia’s involvement in political violence, including the 1977 murder of anti-drugs campaigner Donald Mackay, an action linked to the Calabrian ’ndrangheta criminal group.

Diplomatic targets continued to be hit in the late 1970s and 1980s. Indian diplomatic staff faced kidnapping and assassination attempts, including a stabbing incident and bomb attacks on the Indian High Commission and ambassador’s residence. Similarly, ethnic conflicts overseas led to attacks on Turkish officials in Australia in 1980 and bombings attributed to Armenian militants over the ensuing years.

The 1980s also witnessed a wave of attacks on religious institutions and community sites. Jewish institutions were targeted with bombings and firebombings in Sydney and Melbourne, while ethnic and racial tensions surfaced in attacks on South African embassy employees, African National Congress representatives, and multiple Chinese restaurants, many linked to far-right or white nationalist groups.

Political assassinations and bombings continued into the 1990s, highlighted by the 1994 murder of Labor MP John Newman and a series of unexplained bombings on Sydney railway stations in 1996.

The onset of the 21st century saw the emergence of Islamist extremist threats. Intelligence revealed attempts to train recruits linked to al-Qa’ida within Sydney, and high-profile attacks abroad, such as the 2002 Bali bombings which claimed 88 Australian lives, underscored regional vulnerabilities. Subsequent attacks in Indonesia targeting Australian interests, coupled with foiled plots within Australia, highlighted ongoing risks from extremist groups like Jemaah Islamiah and Islamic State affiliates.

Australian security agencies have repeatedly disrupted plots involving planned mass casualties, including attempts to bomb major public events, carry out vehicular attacks, or execute beheadings in the name of extremist ideologies. Investigations have also uncovered plans targeting critical infrastructure like the national electricity grid.

The past decade has seen a resurgence of attacks on Jewish community sites, culminating in the December 2025 massacre at Bondi Beach, which resulted in 15 deaths and was linked to Islamic State-inspired actors.

Legislative frameworks have evolved alongside these threats. The 1979 ASIO Act initially defined terrorism as violent acts aiming to achieve political objectives, with later amendments broadening offences to include politically motivated violence and the activities of terrorist organizations. Currently, 31 groups, including Islamic State, are formally designated as terrorist organizations under Australian law.

Australia’s history of political violence and terrorism reflects a complex interplay of domestic and international dynamics, involving a range of ideological, ethnic, and criminal motivations. Security agencies continue to face the ongoing challenge of addressing these diverse threats to national safety.