The following is a list of major terrorist attacks and arrests that have been connected to or have been claimed in reliable sources to be inspired by the Islamic State (IS), also known by other names.

Islamic State's predecessor organization, Islamic State of Iraq (ISI) was established in October 2006, after the dissolution of the insurgent groups fighting under the coalition of Mujahideen Shura Council. Under the leadership of its first Emir Abu Omar al-Baghdadi, ISI was in the Iraqi insurgency against American occupation. After the withdrawal of U.S. troops from Iraq, ISI, then-led by Abubakr al-Baghdadi, continued its insurgency against the Iraqi government. In April 2013, the group officially changed its name to "Islamic State of Iraq and Levant" and established a presence in Syria.

Between June 2014, when the group self-proclaimed itself to be the Islamic State, and February 2018, IS has often made claims of responsibility over 140 terrorist attacks in 29 countries outside Syria and Iraq, that were "conducted or inspired" by the group, while the evidences of those claims are not verified. Hundreds of other attacks were also carried out since 2018.

The following is a list of alleged and confirmed attacks carried out by the Islamic State of Iraq organization between 2006 and 2012:

• The 18 April 2007 Baghdad bombings were a series of attacks that occurred when five car bombs exploded across Baghdad, the capital city of Iraq, on 18 April 2007, killing nearly 200 people.^[1] No group claimed responsibility for the attacks. US defense secretary Robert Gates, delivering remarks from Tel Aviv, claimed that Islamic State of Iraq might have perpetrated the attacks.^[2]
• The Qahtaniyah bombings occurred at around 8pm local time on August 14, 2007, when four co-ordinated suicide bomb attacks detonated in the Kurdish towns of Kahtaniya and Jazeera (Siba Sheikh Khidir), near Mosul. Iraqi Red Crescent's estimates say the bombs killed 796 and wounded 1,562 people,^[3] making this the Iraq War's most deadly car bomb attack. No group claimed responsibility for the attack. US military officials alleged that the attacks were launched by ISI fighters.
• The August 2009 Baghdad bombings were three coordinated car bomb attacks and a number of mortar strikes in the Iraqi capital, Baghdad.
• On 25 October 2009, Baghdad bombings there were bombings in Baghdad which killed 155 people and injured at least 721 people.^[4]
• The April 2010 Baghdad bombings were a series of bomb attacks in Baghdad, Iraq that killed at least 85 people over two days. Nouri al-Maliki alleged that the attacks were carried out by the Islamic State of Iraq.^[5]
• The 10 May 2010 Iraq attacks were a series of bomb and shooting attacks that occurred in Iraq on 10 May 2010, killing over 100 people and injuring 350, the highest death toll for a single day in Iraq in 2010.^[6] Iraqi officials alleged that Islamic State of Iraq (ISI) group carried out the attacks in retaliation against the killing of ISI's two high-ranking leaders of U.S. and Iraqi forces.^[7]
• The 2 November 2010 Baghdad bombings were a series of bomb attacks in Baghdad, Iraq, that killed more than 110 people.^[8] While the Islamic State of Iraq did not officially claim responsibility for the attacks, a U.S. military spokesperson alleged that ISI-affiliated fighters might have carried out the attacks.^[9]
• The January 2011 Iraq suicide attacks were a series of three consecutive suicide bombings in Iraq which left at least 133 dead.

• List of Islamist terrorist attacks
• List of terrorists incidents linked to ISIS-K
• List of terrorist incidents, 2014
• List of terrorist incidents, 2015
• List of wars and battles involving ISIL
• List of the terrorist actions against the Mourning of Muharram