The Yellow Sea is the name given to the northern part of the East China Sea, which is a marginal sea of the Pacific Ocean. It is located between mainland China and the Korean peninsula. Its name comes from the sand particles that color its water, originating from the Yellow River.

The innermost bay of the Yellow Sea is called the Bohai Sea (previously Pechihli Bay or Chihli Bay). Into it flows both the Yellow River (through Shandong province and its capital Jinan) and Hai He (through Beijing and Tianjin).

Liaodong Bay, between the Chinese Liaoning province and northwestern North Korea is also part of the Yellow Sea.

The Bohai Sea and Liaodong Bay are separated by the Liaodong Peninsula, with Dalian at its southernmost point.