Armenian genocide denial is the claim that the Ottoman Empire and its ruling party, the Committee of Union and Progress (CUP), did not commit genocide against its Armenian citizens during World War I—a crime documented in a large body of evidence and affirmed by the vast majority of scholars. The perpetrators denied the genocide as they carried it out, claiming that Armenians in the Ottoman Empire were resettled for military reasons, not exterminated. In the genocide's aftermath, incriminating documents were systematically destroyed, and denial has been the policy of every government of the Republic of Turkey, as of 2023.

Borrowing arguments used by the Committee of Union and Progress to justify its actions, denial of the Armenian genocide rests on the assumption that the "relocation" of Armenians was a legitimate state action in response to a real or perceived Armenian uprising that threatened the existence of the empire during wartime. Deniers assert the CUP intended to resettle Armenians rather than kill them. They claim the death toll is exaggerated or attribute the deaths to other factors, such as a purported civil war, disease, bad weather, rogue local officials, or bands of Kurds and outlaws. Historian Ronald Grigor Suny summarizes the main argument as "there was no genocide, and the Armenians were to blame for it". Denial is usually accompanied by "rhetoric of Armenian treachery, aggression, criminality, and territorial ambition".

One of the most important reasons for this denial is that the genocide enabled the establishment of a Turkish nation-state. Recognition would contradict Turkey's founding myths. Since the 1920s, Turkey has worked to prevent official recognition of the genocide or even mention of it in other countries; these efforts have included millions of dollars spent on lobbying, the creation of research institutes, and intimidation and threats. Denial also affects Turkey's domestic policies and is taught in Turkish schools; some Turkish citizens who acknowledge the genocide have faced prosecution for "insulting Turkishness". The century-long effort by the Turkish state to deny the genocide sets it apart from other cases of genocide in history. Azerbaijan also denies the genocide and campaigns against its recognition internationally. Most Turkish citizens and political parties in Turkey support the state's denial policy. The denial of the genocide contributes to the Nagorno-Karabakh conflict as well as ongoing violence against Kurds in Turkey. A 2014 poll of 1500 people conducted by EDAM, a Turkish think-tank, found that 9 percent of Turkish citizens recognize the genocide.

Most historians outside of Turkey recognize that the Ottoman persecution of Armenians was a genocide. However, despite the recognition of the genocidal character of the massacre of Armenians in scholarship as well as in civil society, some governments have been reticent to officially acknowledge the killings as genocide because of political concerns about their relations with the Republic of Turkey.

As of 2023, governments and parliaments of 34 countries, including Argentina, Brazil, Canada, France, Germany, Italy, Mexico, Russia and the United States, have recognized the Armenian genocide. Three countries — Azerbaijan, Turkey, and Pakistan — deny that there was an Armenian genocide.

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• Akçam, Taner (2012). The Young Turks' Crime Against Humanity: The Armenian Genocide and Ethnic Cleansing in the Ottoman Empire. Princeton University Press.
• Akçam, Taner (2019). "When Was the Decision to Annihilate the Armenians Taken?". Journal of Genocide Research. 21 (4): 457–480.
• Bloxham, Donald. The Great Game of Genocide: Imperialism, Nationalism, and the Destruction of the Ottoman Armenians. Oxford: Oxford University Press, 2005.
• Dadrian, Vahakn (1995). The History of the Armenian Genocide: Ethnic Conflict from the Balkans to Anatolia to the Caucasus. Oxford: Berghahn Books.
• Dadrian, Vahakn N.; Akçam, Taner (2011). Judgment at Istanbul: The Armenian Genocide Trials. Berghahn Books.
• De Waal, Thomas (2015). Great Catastrophe : Armenians and Turks in the Shadow of Genocide. Oxford: Oxford University Press.
• Göçek, Fatma Müge (2015). Denial of Violence: Ottoman Past, Turkish Present and Collective Violence Against the Armenians, 1789-2009. Oxford University Press.
• Gutman, David. "Ottoman Historiography and the End of the Genocide Taboo: Writing the Armenian Genocide into Late Ottoman History." Journal of the Ottoman and Turkish Studies Association 2:1 (2015) pp. 167–83
• Kévorkian, Raymond. The Armenian Genocide: A Complete History. London: I.B. Tauris, 2011.
• Morris, Benny; Ze'evi, Dror (2019). The Thirty-Year Genocide: Turkey's Destruction of Its Christian Minorities, 1894–1924. Harvard University Press.
• Suny, Ronald Grigor. "They Can Live in the Desert but Nowhere Else": A History of the Armenian Genocide. Princeton, NJ: Princeton University Press, 2015. ISBN 978-0-691-14730-7

• The Armenian Genocide Institute-Museum
• Timeline of the genocide by Raymond Kévorkian