As of 2026-10-12, Proskurov–Chernovtsy Offensive tops the list with 228,000 deaths.
- #1 Proskurov–Chernovtsy Offensive — 228,000 deaths
1944 military operation
source Wikidata - #2 Operation Harvest Festival — 43,000 deaths
1943 massacre of Jews during the Holocaust
source Wikidata - #3 full-scale Russo-Ukrainian war — 42,295 deaths
full-scale invasion of Ukraine by Russia starting on 24 February 2022, part of Russo-Ukrainian War
source Wikidata - #4 Operation Tannenberg — 20,000 deaths
Nazi extermination operation directed at Poles in early World War II
source Wikidata - #5 Pripyat swamps — 17,288 deaths
1941 Ethnic cleansing of Jewish civilians in Eastern Europe during World War II
source Wikidata - #6 Operation Rat Killer — 5,800 deaths
1951–1952 military operation in the Korean War
source Wikidata - #7 Massacre of the Acqui Division — 5,155 deaths
1943 mass execution of Italian soldiers
source Wikidata - #8 2026 Iran War — 4,859 deaths
ongoing armed conflict in West Asia
source Wikidata - #9 2014 Gaza War — 2,205 deaths
war fought between the Israel Defense Forces and the Hamas-governed Gaza Strip during 2014
source Wikidata - #10 Jallianwala Bagh massacre — 1,500 deaths
British Indian Army troops fire their rifles into crowd of unarmed Indian civilians (1919)
The Jallianwala Bagh massacre, also known as the Amritsar massacre, took place on 13 April 1919. A large crowd had gathered at the Jallianwala Bagh in Amritsar, Punjab, British India, during the annual Baisakhi fair to protest against the Rowlatt Act and the arrest of pro-Indian independence activists Saifuddin Kitchlew and Satyapal. In response to the public gathering, Brigadier-General Reginald Dyer surrounded the people with Gurkhas of Nepalese origin and Sikh infantrymen of the British... Read more on Wikipedia.
Wikidata