The Kyūyō 球陽 is an important historical work about Ryūkyū, compiled by Tei Heitetsu, Sai Kōmo, Ryō Kō, Mō Shihō and others. The draft was started in 1743 and was completed in 1745.
Its records were continued by later historiographers from the Bureau of Genealogies (Keizu-za) until the year 1876. Unlike the official royal records like Chūzan Seikan or Rekidai Hōan, the Kyūyō relates to the history of the people, rather than to that of the ruling class.
The term Kyūyō is also a poetical name for Ryūkyū itself.