(December 1937–January 1938), mass killing and ravaging of Chinese citizens and capitulated soldiers by soldiers of the Japanese Imperial Army after its seizure of Nanjing, China, on Dec. 13, 1937, during the Sino-Japanese War that preceded World War II. The number of Chinese killed in the massacre has been subject to much debate, with most estimates ranging from 100,000 to more than 300,000.

The destruction of Nanjing—which had been the capital of the Nationalist (Nationalist Party) Chinese from 1928 to 1937—was ordered by Matsui Iwane, commanding general of the Central China Front Army that captured the city. Over the next several weeks, Japanese soldiers carried out Matsui's orders, perpetrating numerous mass executions and tens of thousands of rapes. The army looted and burned the surrounding towns and the city, destroying more than a third of the buildings. In 1940 the Japanese made Nanjing the capital of their Chinese puppet government headed by Wang Ching-wei (Wang Jingwei). Shortly after the end of World War II, Matsui and Tani Hisao, a lieutenant general who had personally participated in acts of murder and rape, were found guilty of war crimes by the International Military Tribunal for the Far East and were executed.