Bahari ya Mashariki ya China (ing. East China Sea) ni bahari ya pembeni iliyopo kando ya mashariki mwa nchi ya China, pamoja na Bahari ya Njano na Bahari ya Kusini ya China. Bahari hiyo ni sehemu ya Bahari Pasifiki na ina eneo la kilomita za mraba zipatazo 1,249,000. Nchini China, bahari hii inaitwa Bahari ya Mashariki. Nchini Korea Kusini, bahari hii kuna kipindi huitwa Bahari ya Kusini, lakini hii mara nyingi hutumiwa kutajia eneo la karibu na pwani ya kusini mwa nchi ya Korea Kusini. Pinxian Wang, Qianyu Li, Chun-Feng Li, Geology of the China Seas (2014), p. 667. "The four seas of China, the Bohai Sea, the Huanghai Sea, the East China Sea, and the South China Sea, occupy a total area of about 4.7 million km2, half of the area of China mainland. These seas are located in the southeastern margin of the Eurasian continent and subject to the interactions between the Eurasian, Pacific, and Indian-Australian plates. The seas have complicated geology and rich natural resources".