Kien Gian River is a river in Le Thuy District, Quang Binh Province, North Central Coast, Vietnam. The length of the river is 58 km. It is a tributary of the Nhat Le River.
The Kien Giang River originates in the Annamite Range where various streams add water to it. Unlike other rivers in Vietnam which flow southeast, the Kien Giang River flows northeast, and creates a narrow delta in Le Thuy District. It meets the Long Dai River in Quang Ninh District, Quang Binh Province, and together they create the Nhat Le River.