Dr. Azahari bin Husin (14 September 1957 – 9 November 2005), also Azahari Husin, Azhari Husin, was a Malaysian who was believed to be the technical mastermind behind the 2002 Bali bombing. He was killed in a police raid on his hideout in Indonesia in 2005. He was nicknamed the "Demolition Man".
He received extensive bomb training in Afghanistan. He authored the JI bomb manual, used in the Bali bombing and the 2003 Marriott Hotel bombing. He also planned the 2004 Jakarta embassy bombing and was implicated in the 2005 Bali bombings. Prior to his death, he was one of the most wanted men in Indonesia along with Noordin Mohammed Top.
In July 2004, Husin and Noordin narrowly escaped a police raid on a rented house west of Jakarta, where forensic experts later found traces of explosives used in the embassy bombing. Neighbours described both as reclusive men who left the property only to pray at a nearby mosque; and they said that before the bombing, they saw the duo loading heavy boxes into a white delivery van which is the same type used in that attack. 
On 9 November 2005, Indonesian police, acting on a tip-off, located Husin. They conducted a raid on one of his hideouts in Batu, near Malang in East Java with Detachment 88 operators sent to assist regular police officers. Three suspected jihadist terrorists barricaded themselves inside a house and they put up stiff resistance, throwing grenades and firing bullets at the police outside. This was followed by a series of explosions, one of which was a suicide blast by his assistant setting off his bomb vest. Police identified the intact corpse of Azahari, with a bullet wound in his chest. Husin was shot and killed by a police sniper, after which one of his disciples blew himself up to prevent him from being taken alive.
- "Bali bombings: 'Demolition Man,' 'Moneyman' key suspects". Rediff India Abroad. 2005. Retrieved 29 March 2006.
- "Who is Azahari Husin?". Sydney Morning Herald. 10 September 2004. Retrieved 29 March 2006.
- "Bali bomb maker believed dead". BBC. 10 November 2005.
- Chew, Amy (10 November 2005). "Azahari Dead". New Straits Times, p. 1, 4.