List of war crimes
According to various media reports, between 1,000 and 1,200 Lebanese citizens (including Hezbollah fighters) were reported dead; there were between 1,500 and 2,500 people wounded and over 1,000,000 were temporarily displaced. Over 150 Israelis were killed (120 military); thousands wounded; and 300,000–500,000 were displaced because of Hezbollah firing tens of thousands of rockets at major cities in Israel.

2003–2020 War in Darfur and Chadian Civil War: During the War in Darfur and the Chadian Civil War, reports of humans rights abuses and genocide surfaced, accusing the Sudanese Armed Forces and Janjaweed militias in Darfur and Eastern Chad.
Sudanese authorities claim a death toll of roughly 19,500 civilians while many non-governmental organizations, such as the Coalition for International Justice, claim over 400,000 people have been killed.
In September 2004, the World Health Organization estimated there had been 50,000 deaths in Darfur since the beginning of the conflict, an 18-month period, mostly due to starvation. An updated estimate the following month put the number of deaths for the six-month period from March to October 2004 due to starvation and disease at 70,000; These figures were criticised, because they only considered short periods and did not include deaths from violence. A more recent British Parliamentary Report has estimated that over 300,000 people have died, and others have estimated even more.

2008–2009 Gaza War: There were allegations of war crimes by both the Israeli military and Hamas. Criticism of Israel's conduct focused on the proportionality of its measures against Hamas, and on its alleged use of weaponised white phosphorus. Numerous reports from human right groups during the war claimed that white phosphorus shells were being used by Israel, often in or near populated areas. In its early statements the Israeli military denied using any form of white phosphorus, saying "We categorically deny the use of white phosphorus". It eventually admitted to its limited use and stopped using the shells, including as a smoke screen. The Goldstone report investigating possible war crimes in the 2009 war accepted that white phosphorus is not illegal under international law but did find that the Israelis were "systematically reckless in determining its use in build-up areas". It also called for serious consideration to be given to the banning of its use as an obscurant.

1983 - 2009 Sri Lankan Civil War: There are allegations that war crimes were committed by the Sri Lankan military and the rebel Liberation Tigers of Tamil Eelam during the Sri Lankan Civil War, particularly during the final months of the conflict in 2009. The alleged war crimes include attacks on civilians and civilian buildings by both sides; executions of combatants and prisoners by the government of Sri Lanka; enforced disappearances by the Sri Lankan military and paramilitary groups backed by them; acute shortages of food, medicine, and clean water for civilians trapped in the war zone; and child recruitment by the Tamil Tigers.
A panel of experts appointed by UN Secretary-General (UNSG) Ban Ki-moon to advise him on the issue of accountability with regard to any alleged violations of international human rights and humanitarian law during the final stages of the civil war found "credible allegations" which, if proven, indicated that war crimes and crimes against humanity were committed by the Sri Lankan military and the Tamil Tigers. The panel has called on the UNSG to conduct an independent international inquiry into the alleged violations of international law. The Sri Lankan government has denied that its forces committed any war crimes and has strongly opposed any international investigation. It has condemned the UN report as "fundamentally flawed in many respects" and "based on patently biased material which is presented without any verification".

2011–present: Syrian civil war: International organizations have accused the Syrian government, ISIL and other opposition forces of severe human rights violations, with many massacres occurring. Chemical weapons have been used many times during the conflict as well. The Syrian government is reportedly responsible for the majority of civilian casualties and war crimes, often through bombings. In addition, tens of thousands of protesters and activists have been imprisoned and there are reports of torture in state prisons. Over 470,000 people were killed in the war by 2017.

2015–present: Kurdish–Turkish conflict: According to the U.S. State Department 2016 Human Rights Report, in February 2016, Turkish security forces killed at least 130 people, including unarmed civilians, who had taken shelter in the basements of three buildings in the town of Cizre. A domestic NGO, The Human Rights Association (HRA), said the security forces killed more than 300 civilians in the first eight months of 2016. In March 2017, the United Nations voiced "concern" over the Turkish government's operations and called for an independent assessment of the "massive destruction, killings and numerous other serious human rights violations" against the ethnic Kurdish minority.

2020 Nagorno-Karabakh war: UN Secretary-General António Guterres stated that "indiscriminate attacks on populated areas anywhere, including in Stepanakert, Ganja and other localities in and around the immediate Nagorno-Karabakh zone of conflict, were totally unacceptable". Amnesty International stated that both Azerbaijani and Armenian forces committed war crimes during recent fighting in Nagorno-Karabakh, and called on Azerbaijani and Armenian authorities to immediately conduct independent, impartial investigations, identify all those responsible, and bring them to justice.

2020–2022: Tigray War: During the Tigray War, which included fighting between the Ethiopian National Defense Force (ENDF) soldiers and Tigray People's Liberation Front (TPLF) forces in the Tigray Region, the Ethiopian Human Rights Commission (EHRC) described the 9–10 November 2020 Mai Kadra massacre committed by Tigray youth group "Samri" in its 24 November 2020 preliminary report as "grave human rights violations which may amount to crimes against humanity and war crimes".

2022–present: Russo-Ukrainian War: During the Russian invasion of Ukraine, multiple buildings such as airports, hospitals, kindergartens were bombed. There has been abuse of prisoners of war.
In April 2022 bodies of civilians murdered by Russian forces were found in the town of Bucha, which had been left after the occupation of the town. It was confirmed at least more than 300 bodies were in mass graves or stranded on the streets of the city. As of 22 April 2022 there have been more than 500 confirmed bodies.
The Siege of Mariupol started on 24 February 2022 and ended on 20 May 2022. It has been confirmed at thousands of lives have been claimed through the siege and that the city has been reduced to rubble.
On 21 April 2022, Satellite images showed mass graves around the besieged city of Mariupol. It has been confirmed at least 9,000+ bodies have been found since. On the same day Vladimir Putin ordered troops to blockade the Azovstal Steel Plant, the last Ukrainian controlled place in the besieged city of Mariupol. The steel plant had more than 1,000 Ukrainians confirmed inside of it.
On 17 March 2023, the International Criminal Court (ICC) issued arrest warrants for Vladimir Putin and Russia's Commissioner for Children's Rights Maria Lvova-Belova for war crimes of deportation and illegal transfer of children from occupied Ukraine to Russia.
On 13 June 2023, Russian troops murdered 6 civilians in Sumy Oblast near Seredyna-Buda, mutilated their bodies, and then mined the place to kill people who tried to retrieve their bodies. They also blocked retrieval of bodies for 2 more days.  This case is currently being investigated by Ukrainian authorities.

2023–present: Israel–Hamas war: An ongoing armed conflict between Israel and Palestinian militant groups led by Hamas began on 7 October 2023 with a coordinated surprise attack on Israel.
In April 2024, the United Nations Human Rights Council (UNHRC) adopted a resolution calling for Israel to be held accountable for possible war crimes and crimes against humanity in the Gaza Strip, and demanding a halt to all arms sales to the country. 28 countries voted in favor, 13 abstained, and six voted against. Israel's ambassador accused the UN of anti-Israeli bias.

See also: Crimes against humanity
Crimes against humanity under communist regimes
Russian war crimes
Soviet war crimes
War crimes of the Wehrmacht
Democide
Ethnic cleansing
Geneva Conventions
Genocide
Genocides in history
Genocide of indigenous peoples
The Holocaust
International humanitarian law
International law
Laws of war
List of ethnic cleansing campaigns
List of genocides
List of most-wanted Nazi war criminals, according to the Simon Wiesenthal Center
List of war criminals
Mass killings under communist regimes
Mass murder
Military history
Second Italo-Ethiopian War
Second Sino-Japanese War
Spanish Civil War
Bosnian War
Russian invasion of Ukraine
Torture
War crime
World War I
World War II

Notes: 

References: 

External links: 1944–1945 Killing of Allied POWs in Europe
A Criminological Analysis of the Invasion and Occupation of Iraq By Ronald C. Kramer and Raymond J. Michalowski
Kramer, Alan: Atrocities, in: 1914-1918-online.