The State of Wei is a Zhou Dynasty vassal state during the Warring States Period (475–221 BCE) of Chinese history.

Its territory lies between the states of Qin and Qi and included parts of modern day Henan, Hebei, Shanxi and Shandong.

After its capitalis moved from Anyi to Daliang (today Kaifeng) during the reign of King Hui of Wei, Wei is also called the state of Liang.