Khanbulanchay reservoir (), also known as Khanbulaqchay reservoir (), is a reservoir in Lankaran Rayon of southeastern Azerbaijan. The name means "the spring of the khan" in Azerbaijani language.
The reservoir was built on the in 1976. The overall area is . The volume of water in the reservoir is 52 million mó. The altitude of the dam built on the reservoir is , the length is . The reservoir is used for irrigation purposes in of land in the subtropical zone through the and long channels.