Changshan Commandery (常山郡), or Hengshan Commandery (恒山郡), was a historical commandery of China, located in present-day southern Hebei province. The commandery was established as Hengshan by the Qin state after it annexed the state of Zhao. After the foundation of Han dynasty, it became part of the Zhao Kingdom. During Empress Dowager Lü's reign, it was briefly granted to Liu Buyi (劉不疑), son of the Emperor Hui, as his fief. After the death of Buyi, the territory was first passed to Liu Hong, Emperor Houshao of Han, then it was granted to Liu Chao (劉朝), another son of Emperor Hui. During the defeat of the Lü clan, Liu Chao was killed and the territory again became a commandery of Zhao. The name was later changed to Changshan for the naming taboo of Emperor Wen of Han (personal name Liu Heng).