King Zhao of Zhou was the fourth king of the Zhou dynasty. He ruled from 977/75 BC until his death twenty years later. Famous for his disastrous war against the Chu confederation, his death in battle ended the Western Zhou's early expansion and marked the beginning of his dynasty's decline.

The Zhou dynasty was a royal dynasty of China that existed for 789 years from c. 1046 BC until 256 BC, the longest such reign in Chinese history. During the Western Zhou period, the royal house, surnamed Ji, had military control over ancient China. Even as Zhou suzerainty became increasingly ceremonial over the following Eastern Zhou period (771–256 BC), the political system created by the Zhou royal house survived in some form for several additional centuries. A date of 1046 BC for the Zhou's establishment is supported by the Xia–Shang–Zhou Chronology Project and David Pankenier, but David Nivison and Edward L. Shaughnessy date the establishment to 1045 BC.