Henan Commandery (Chinese: 河南郡) was a commandery in China from Han dynasty to Tang dynasty, located in modern northern Henan province. During the reign of King Xuanhui of Han, Sanchuan Commandery (三川郡) was established. It was named Sanchuan ("Three Rivers") because the Yellow River, Yi River and Luo River flowed through its jurisdiction. In 249 BC, Sanchuan was annexed by the state of Qin. In the Western Jin dynasty, the name "Henan Commandery" was restored. In 266, Xingyang Commandery was established from 8 counties in Henan.