The deadliest earthquake in history, the Shaanxi earthquake, hits Shaanxi province, China. The death toll may have been as high as 830,000.

An earthquake – also called a quake, tremor, or temblor – is the shaking of the Earth's surface resulting from a sudden release of energy in the lithosphere that creates seismic waves. Earthquakes can range in intensity, from those so weak they cannot be felt, to those violent enough to propel objects and people into the air, damage critical infrastructure, and wreak destruction across entire cities. The seismic activity of an area is the frequency, type, and size of earthquakes experienced over a particular time. The seismicity at a particular location in the Earth is the average rate of seismic energy release per unit volume.

The 1556 Shaanxi earthquake, known in Chinese colloquially by its regnal year as the Jiajing Great Earthquake "嘉靖大地震" or officially by its epicenter as the Hua County Earthquake "华县地震", occurred in the early morning of 2 February 1556 in Huaxian, Shaanxi, during the Ming dynasty.

Shaanxi is a province in north Northwestern China. It borders the province-level divisions of Inner Mongolia to the north; Shanxi and Henan to the east; Hubei, Chongqing, and Sichuan to the south; and Gansu and Ningxia to the west. Shaanxi covers an area of over 205,000 km² (79,000 sq mi) with about 37 million people, the 16th-largest in China. Xi'an – which includes the sites of the former capitals Fenghao and Chang'an – is the provincial capital and largest city in Northwest China and also one of the oldest cities in China and the oldest of the Four Ancient Capitals, being the capital for the Western Zhou, Western Han, Jin, Sui and Tang dynasties. Xianyang, which served as the capital of the Qin dynasty (221–206 BC), is just north across the Wei River. The other prefecture-level cities into which the province is divided are Ankang, Baoji, Hanzhong, Shangluo, Tongchuan, Weinan, Yan'an and Yulin.