Emperor Mingyuan of Northern Wei (392–423), personal name Tuoba Si, is an emperor of the Chinese/Xianbei dynasty Northern Wei.

He is the oldest son of the founding emperor Emperor Daowu.

During his reign, Northern Wei's territory does not expand as much as under either his father's reign or the reign of his son Emperor Taiwu, but he helps the state stabilize over northern China, and starts the tradition of meeting with important imperial officials to listen to their advice and make final decisions.

He is generally regarded by historians to be an intelligent and rational ruler.