Sima Xun (306–366), courtesy name Weichang, was a military general and warlord of the Jin dynasty (266–420). Following the destruction of the Han Zhao state in 329, Sima Xun fled south to his family's regime in Jiankang, where he grew to hold both military and provincial power. Based in Liangzhou, he participated in a series of northern expeditions in the mid-4th century but was ultimately unsuccessful. Xun was cruel and ambitious, and in 365, he rebelled in hopes of claiming independence in Liangzhou. However, his rebellion was quelled by Zhu Xu in a matter of months, and he was subsequently executed by Huan Wen.