Pei Wei (267–300), courtesy name Yimin, was a Chinese essayist, philosopher, physician, and politician of the Western Jin dynasty. He was the cousin of Jia Nanfeng and rose to prominence during the reign of her husband, the Emperor Hui of Jin. Pei Wei was seen by traditional historian as one of Empress Jia's exemplary supporters along with Zhang Hua and Jia Mo. He pushed for a number of significant reforms during his tenure which met with mixed success before his execution by the Prince of Zhao, Sima Lun, in 300 following Sima Lun's coup.
