Map - Zhengzhou (Zhengzhou Shi)

Zhengzhou, also spelt Zheng Zhou and alternatively romanized as Chengchow, is the capital and largest city of Henan Province in the central part of the People's Republic of China. Located in north-central Henan, it is one of the National Central Cities in China, the centre of Central Plains area, and serves as the political, economic, technological, and educational center of the province. The Zhengzhou metropolitan area (including Zhengzhou and Kaifeng) is the core area of the Central Plains Economic Zone.

The city lies on the southern bank of the Yellow River. Zhengzhou is a major hub of China's national transportation network, with railways connecting Zhengzhou to Europe and an international airport. Zhengzhou is a National Civilized City and a State-list Famous Historical and Culture City. As of 2020, there are two World Cultural Heritage Sites in Zhengzhou. The Zhengzhou Commodity Exchange (ZCE) is China's first futures exchange. Zhengzhou Airport Economy Zone is China's first Airport Economy Zone.

As of the 2020 Chinese census, the prefecture-level city of Zhengzhou had a population of 12,600,574 inhabitants, whom 10,260,667 lived in its built-up (or metro) area made of 6 urban districts plus Zhongmu county, Xinzheng and Xingyang cities now largely being conurbated. The city had a total GDP of 1.014 trillion (RMB) in 2018. Greater Zhengzhou was named as one of the 13 emerging mega-cities in China in a July 2012 report by the Economist Intelligence Unit, and officially named as the eighth National Central City in 2017 by the central government in Beijing.

Zhengzhou is a major city for scientific research, appearing among the world's top 100 cities as tracked by the Nature Index. The city is home to several national key universities in China, notably Zhengzhou University, Henan University, Henan Agricultural University, Henan University of Chinese Medicine, and Henan University of Technology.

The Shang dynasty established Aodu (隞都) or Bodu (亳都) in Zhengzhou. This prehistorical city had become abandoned as ruins long before the First Emperor of China in BC 260. Since 1950, archaeological finds in a walled city in Eastern Zhengzhou have provided evidence of Shang dynasty settlements in the area around BC 1600. Outside this city, remains of large public buildings and a complex of small settlements have been discovered. The site is generally identified with the Shang capital of Ao and is preserved in the Shang dynasty Ruins monument in Guanchen District. The Shang, who continually moved their capital due to frequent natural disasters, left Ao at around 13th century BC. The site, nevertheless, remained occupied; Zhou (post-1050 BC) tombs have also been discovered. Legend suggests that in the Western Zhou period (1111–771 BC) the site became the fief of a family named Guan. From this derives the name borne by the county (xian) since the late 6th century BC—Guancheng (City of the Guan). The city first became the seat of a prefectural administration in AD 587, when it was named Guanzhou. In 605 it was first called Zhengzhou—a name by which it has been known virtually ever since.

The name Zhengzhou came from the Sui dynasty (AD 582), even though it was located in Chenggao, another town. The government moved to the contemporary city during the Tang dynasty. It achieved its greatest importance under the Sui (AD 581–618), Tang (618–907), and early Song (960–1127) dynasties, when it was the terminus of the New Bian Canal, which joined the Yellow River to the northwest. There, at a place called Heyin, a vast granary complex was established to supply the capitals at Luoyang and Chang'an to the west and the frontier armies to the north. In the Song period, however, the transfer of the capital eastward to Kaifeng robbed Zhengzhou of much of its importance.

In 1903 the Beijing–Hankou Railway arrived at Zhengzhou, and in 1909 the first stage of the Longhai Railway gave it an east–west link to Kaifeng and Luoyang; it later was extended eastward to the coast at Lianyungang, Jiangsu, and westward to Xi'an (Chang'an), Shaanxi, as well as to western Shaanxi. Zhengzhou thus became a major rail junction and a regional center for cotton, grain, peanuts, and other agricultural produce. Early in 1923 a workers' strike began in Zhengzhou and spread along the rail line before it was suppressed; a 14-story double tower in the center of the city commemorates the strike. On June 10, 1938, Chiang Kai-shek's National Revolutionary Army opened up the dikes retaining the Yellow River at Huayuankou between Zhengzhou and Kaifeng, in an effort to stem the tide of invading Japanese; however, the ensuing 1938 Yellow River flood also killed hundreds of thousands of Chinese.

Zhengzhou also has a locomotive and rolling-stock repair plant, a tractor-assembly plant, and a thermal generating station. The city's industrial growth has resulted in a large increase in the population, coming predominantly from industrial workers from the north. A water diversion project and pumping station, built in 1972, has provided irrigation for the surrounding countryside. The city has an agricultural university.

In July 2021, record breaking floods left over a million people displaced and at least 300 people dead.