Guijiahu Reservoir () is a reservoir located in Zhenning Buyei and Miao Autonomous County, Guizhou, China. It covers a total surface area of and has a storage capacity of some of water.
It is called Guijiahu Reservoir due to the dam is located in the Guijiabao Village of Guijia Township ().
Construction of the reservoir began in 1958 and were completed in 1966.
The reservoir provide water for irrigation, hydroelectric power and recreational activities.
The dam is high, long, and thick, and was completed in 1998.