Wei is a state of Dingling ethnicity that exists during China's Sixteen Kingdoms period—specifically, from 388 to 392.

Its founder Zhai Liao had previously been vacillating between being a vassal of Later Yan, Western Yan, or Jin Dynasty (265-420), and in 388, after his last overture to reconcile with Later Yan's emperor Murong Chui is rejected by Murong Chui, he declares his own state, over the territory of modern central and eastern Henan.

In 392, Wei, then under Zhai Liao's son Zhai Zhao, is destroyed by Later Yan forces.

Because of its relatively small size and short lifespan, Wei is generally not included by historians among the Sixteen Kingdoms.The rulers of Wei use the title "Heavenly Prince" (Tian Wang), roughly equivalent to emperor.