Since the establishment of Republic of Turkey, Turkey commited war crimes like in the Syrian Civil War, Turkish invasion of Cyprus and so on.

Even before its establishment, Three Pashas commited genocides in World War One against Armenian, Greek and Assyrian victims. Massacres also continued during the Turkish War of Independence by both sides. Turkey still continues to deny the genocides. After 1923, war crimes also occured during the Syrian Civil War and Second Libyan Civil War.

Hamidian massacres were the mass killings of Armenian and Assyrian victims during 1894-97, which ordered by Abdulhamid II. Massacre resulted with the death of 300,000 civilians.

During the last years of the Ottoman Empire, CUP government radicalized and genocided Greek, Armenian and Assyrian people. According to Rudolph Joseph Rummel's statistics, the Turks massacred from 3,500,000 to 4,300,000 Armenian, Greek, Assyrian and other christian groups.

During the Turkish War of Independence, Ankara government was responsible for massacres of Armenians, Greeks and other christian populations. Vahagn Avedian states the Turkish War of Independence were nothing more than a "ethnic cleansing campaign to get rid of christians".

During Syrian civil war, Turkey was accused by supporting Islamic State generally by pro-Kurdish persons. Pro- Kurdish party in Turkey, HDP also claimed Turkey allowed ISIL soldiers cross Turkish - Syrian border and siege Kobanî. It is claimed that in 2018, at least 66 civilian were killed during Turkish airstrikes. In 2019, an Amnesty International article had accused Turkey and its allies with doing war crimes. In 2024, Turkish drone strikes in Tishreen dam caused 413 thousand Kurds left without electricity and drinkable water.
SOHR claims that Turkey used child soldiers in Libya.