Jian, King of Qi (Chinese: 齊王建; pinyin: Qí Wáng Jiàn; reigned 264–221 BC) was the last king of Qi, one of the seven major states of the Warring States period of ancient China. His personal name was Tian Jian (田建), ancestral name Gui, and he did not have a posthumous title because he was the last king of Qi. Later in the Han dynasty, the official Wang Mang usurped the emperor and took the throne. Wang Mang proclaimed to have descended from Jian of Qi (through from the Eighteen Kingdoms) and awarded him the posthumous name King Jing of Qi (齊敬王) and the temple name Emperor Shizu of Xin (新世祖).