The Tangshan earthquake, also known as the Great Tangshan earthquake, was a natural disaster that occurred on July 28, 1976. It is believed to be the largest earthquake of the 20th century by death toll. The epicenter of the earthquake was near Tangshan in Hebei, People's Republic of China, an industrial city with approximately one million inhabitants.

The number of deaths initially reported by the Chinese government was 655,000, but this number has since been stated to be around 240,000 to 255,000. Another report indicates that the actual death toll was much higher, at approximately 650,000, and explains that the lower estimates are limited to Tangshan and exclude fatalities in the densely populated surrounding areas.

A further 164,000 people were recorded as being severely injured. The earthquake occurred between a series of political events involving the Communist Party of China, ultimately leading to the expulsion of the ruling Gang of Four by Mao Zedong's chosen successor, Hua Guofeng. In traditional Chinese thought, natural disasters are seen as a precursor of dynastic change.