The Yangtze, Yangzi or Cháng Jiāng ( /ˈjæŋtsi/ or /ˈjɑːŋtsi/; Mandarin [jɑ̌ŋtsɨ̀ tɕjɑ́ŋ]) is the longest river in Asia, and the third longest in the world. It flows for 6,418 kilometres (3,988 mi) from the glaciers on the Tibetan Plateau in Qinghai eastward across southwest, central and eastern China before emptying into the East China Sea at Shanghai. It is also one of the biggest rivers by discharge volume in the world. The Yangtze drains one-fifth of the land area of the People's Republic of China (PRC) and its river basin is home to one-third of the PRC's population.

Along with the Yellow River, the Yangtze is the most important river in the history, culture and economy of China. The prosperous Yangtze River Delta generates as much as 20% of the PRC's GDP. The Yangtze River flows through a wide array of ecosystems and is itself habitat to several endemic and endangered species including the Chinese alligator and the Yangtze sturgeon. For thousands of years, man has used the river for water, irrigation, sanitation, transportation, industry, boundary-marking and war. The Three Gorges Dam on the Yangtze River is the largest hydro-electric power station in the world.