Chūzan is one of three kingdoms that control Okinawa in the fourteenth century.

Okinawa, previously controlled by a number of local chieftains or lords, loosely bound by a paramount chieftain or king of the entire island, splitd into these three more solidly defined kingdoms within a few years after 1314; the Sanzan period thus begins, and ends roughly one hundred years later, when Chūzan's King Shō Hashi conquers Hokuzan in 1419 and Nanzan in 1429.The united Okinawan state is called the Ryūkyū Kingdom, but will continue to be referred to as "Chūzan" in various official documents of the Ryukyuan royal government, and those of many other states in the region.