As of 2026-10-12, Cambodian genocide tops the list with 1,200,000 deaths.
- #1 Cambodian genocide — 1,200,000 deaths
genocide of as many as 3,000,000 Cambodians by communist Khmer Rogue in 1975–79
The Cambodian genocide was the systematic persecution and killing of Cambodian citizens by the Khmer Rouge under the general secretaryship of Pol Pot. It resulted in the deaths of approximately 2 million people from 1975 to 1979, around 25% of Cambodia's population in 1975. Read more on Wikipedia.
Wikidata - #2 Porajmos — 500,000 deaths
mass murder against Roma people in Europe
The Romani Holocaust, also known as the Porajmos, was the genocide of European Roma and Sinti people during World War II. Beginning in 1933, Nazi Germany systematically persecuted the European Roma, Sinti and other peoples through forcible internment and compulsory sterilization. German authorities summarily and arbitrarily subjected Romani people to incarceration, forced labor, deportation and mass murder in concentration and extermination camps. Read more on Wikipedia.
Wikidata - #3 White Terror — 500,000 deaths
Russian Civil War period of political repression and mass killings in 1918 carried out by the White Army
The White Terror in the former Russian Empire refers to violence and mass killings carried out by the White movement and its governments of Russia during the Russian Civil War (1917–1923). Individual acts against Bolshevik rule, such as assassinations, commenced at least by the end of 1917. Violence on any sizable scale on the part of the Whites arguably began in early 1918, continuing until the defeat of the Whites at the hands of the Red Army from 1920 to 1922. Unlike in the case of the Red... Read more on Wikipedia.
Wikidata - #4 crushing The Rebellions of 1965–1966 — 500,000 deaths
large scale political, state-sponsored killings in Indonesia between 30th September 1965, into 1966
From October 1965 to March 1966, a series of large-scale killings and civil unrest primarily targeting members and supposed sympathizers of the Communist Party of Indonesia (PKI) took place in Indonesia. Other affected groups included alleged communist sympathisers, Gerwani women, trade unionists, ethnic Javanese Abangan, ethnic Chinese, atheists and other non-Muslims, and leftists in general. According to the most widely published estimates, at least 500,000 to 1 million people were killed.... Read more on Wikipedia.
Wikidata - #5 Nazi executions of ill people — 216,000 deaths
systematic murder of around 216,000 people with physical, mental and emotional disabilities during the Nazi era in Germany and the occupied or annexed territories from 1933 to 1945
source Wikidata - #6 Ponary massacre — 100,000 deaths
mass executions carried out by Germans and Lithuanians near Vilnius in 1941–1944
The Ponary massacre, or the Paneriai massacre, was the mass murder of up to 100,000 people, mostly Jews, Poles, and Russians, by German SD and SS and the Lithuanian Ypatingasis būrys killing squads, during World War II and the Holocaust in the Generalbezirk Litauen of Reichskommissariat Ostland. The murders took place between July 1941 and August 1944 near the railway station at Ponary, a suburb of today's Vilnius, Lithuania. 70,000 Jews were murdered at Ponary, along with up to 2,000 Poles,... Read more on Wikipedia.
Wikidata - #7 1624 Baghdad massacre — 100,000 deaths source Wikidata
- #8 Intelligenzaktion — 100,000 deaths
secret mass murder conducted by Nazi Germany against the Polish intelligentsia early in the Second World War
The Intelligenzaktion (German pronunciation: [ɪntɛliˈɡɛnt͡s.akˌt͡sjoːn] was a series of mass murders committed against the Polish intelligentsia during the early years of the Second World War by Nazi Germany. The Germans conducted the operations in accordance with their plan to Germanize the western regions of occupied Poland, before their territorial annexation to the German Reich. Read more on Wikipedia.
Wikidata - #9 Massacres of Poles in Volhynia and Eastern Galicia — 80,000 deaths
massacre of Poles by Ukrainian nationalists during World War II
The massacres of Poles in Volhynia and Eastern Galicia were carried out in German-occupied Poland by the Ukrainian Insurgent Army (UPA), with the support of parts of the local Ukrainian population, against the Polish minority in Volhynia, Eastern Galicia, parts of Polesia, and the Lublin region from 1943 to 1945. The UPA's actions resulted in up to 100,000 Polish deaths. Read more on Wikipedia.
Wikidata - #10 massacres of Albanians in the Balkan Wars — 50,000 deaths
Killings of Albanians during the Balkan Wars of 1912–1913
Massacres of Albanians in the Balkan Wars were perpetrated on several occasions by the Serbian and Montenegrin armies and paramilitaries between 1912 and 1913. During the 1912–13 First Balkan War, Serbia and Montenegro committed a number of war crimes against the Albanian population after expelling Ottoman Empire forces from present-day Albania, Kosovo, and North Macedonia, which were reported by the European, American and Serbian opposition press. Most of the crimes occurred between October... Read more on Wikipedia.
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