Milperra massacre - Two biker gangs, the Comanchero and the Bandidos, engaged in a shoot-out in a hotel car park, killing 7 people in 1984, including a bystander. Only one defendant was acquitted on the murder charges.

Joseph Schwab - 1987, Schwab shot dead 5 people in and around the Kimberley region in Western Australia before being shot dead by police.[3]

Hoddle Street massacre - Armed with two rifles and a shotgun, Julian Knight shot 7 people dead and wounded another 19 in 1987 before surrendering to authorities . Queen Street massacre - Armed with a sawn-off rifle, Frank Vitkovic roamed the Australia Post building on December the 8th 1987 . killing 8 and wounding 5, also in 1987. When the weapon was finally wrestled from him, he committed suicide by jumping out of a nearby window.

Surry Hills massacre - Paul Anthony Evers killed 5 people with a 12-gauge shotgun at a public housing precinct in Surry Hills in 1990 before surrendering to police.[4]

Strathfield massacre - In 1991 Wade Frankum killed 7 people and wounded 6 others with a large knife and an SKS before turning the gun on himself when he realised he could not escape.

Central Coast massacre - In 1992, Malcolm Baker killed 6 people and injured another with a shotgun in 1992 before being arrested by police.

Port Arthur massacre - In 1996, armed with two semi-automatic rifles, Martin Bryant killed 35 people around Port Arthur and wounded 21 before being caught by police the next day following an overnight siege. Childers Palace Fire - In June 2000, drifter and con-artist Robert Long started a fire at the Childers Palace backpackers hostel that killed 15 people.

Sef Gonzales - On July 10, 2001, Sef Gonzales bludgeoned to death his sister, mother and father with a baseball bat. Monash University shooting - In October 2002, Huan Yun Xiang, a student, shot his classmates and teacher, killing two and injuring five.

Churchill Fire - 10 confirmed deaths due to a deliberately lit fire. The fire was lit on 7 February 2009.[5] Lin family murders - On July 2009, Lian Bin "Robert" Xie killed his sister, her husband and three members of their family (5 persons from the Lin family) with a hammer. The faces of the victims were so disfigured that forensics had to be used to identify them. The motivation for the family massacre were partly because Lin had criticised Xie for not having a job.

2011 Hectorville siege - A mass shooting that took place on Friday, April 29, 2011, in Hectorville, South Australia. It began after a 39-year-old male, Donato Anthony Corbo, went on a shooting rampage, killing three people and wounding a child and two police officers, before being arrested by Special Operations police after an eight-hour siege.[6]

Quakers Hill Nursing Home Fire - 10 confirmed and as many as 21 people may have died as a result of a deliberately lit fire in a Quakers Hill nursing home. The fire was lit early on 18 November 2011.[7] Hunt family murders - Geoff Hunt killed his wife and three children before turning the gun on himself on September 9, 2014.[8]

Cairns stabbings - A woman stabbed 8 children to death on Friday, 2014, December 19, 2014. 7 of them were her own.[9]