Caizhou or Cai Prefecture was a zhou (prefecture) in imperial China in modern Henan, China, seated in modern Runan County. It existed (intermittently) from 606 until 1293.
Shi Weile, ed. (2005). Zhongguo Lishi Diming Da Cidian (中国历史地名大词典) [Large Dictionary of Chinese Historical Place Names] (in Chinese). China Social Sciences Press. p. 2785. ISBN7-5004-4929-1.