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This category is for articles that describe aggressions, violence and mortal attacks on humans by other humans in year 1921.

v t e Lists of massacres
List of massacres at sea
By past country or territory	Mandatory Palestine Ottoman Syria Ottoman Bulgaria Palestinian territories Roman Judea Soviet Union Yugoslavia
By country or territory	Afghanistan Albania Algeria Argentina Australia Azerbaijan Bangladesh Belarus Belgium Bolivia Bosnia and Herzegovina Brazil Burundi Canada Chile China Colombia Croatia Cyprus Czech Republic Democratic Republic of the Congo Dominican Republic East Timor Egypt El Salvador Ethiopia Finland France Germany Greece Great Britain Guatemala Guinea Guyana Haiti Hungary Iceland India Indonesia Iran Iraq Ireland Israel Jerusalem Italy Jamaica Japan Kenya Latvia Lebanon Libya Lithuania Mali Malaysia Mexico Myanmar Nepal New Zealand Nigeria North Korea North Macedonia Pakistan Peru Philippines Poland Puerto Rico Romania Russia Rwanda São Tomé and Príncipe Serbia Singapore Slovakia Slovenia Solomon Islands South Africa South Korea South Sudan Spain Sri Lanka Sudan Syria Taiwan Thailand Turkey Uganda Ukraine United States Venezuela Vietnam Yemen
By war	1948 Palestine war Algerian Civil War Bosnian War Croatian War of Independence Eritrean War of Independence Finnish Civil War Kosovo War Nagorno-Karabakh conflict Syrian civil war Greco-Turkish War World War I World War II Yugoslavia
By group	Armenians Azerbaijanis Hazara people Indigenous Australians Nizari Ismailis Turkish people
See also	List of genocides List of anthropogenic disasters by death toll
Massacres Massacres by country Massacres by year