Danjiangkou (Chinese: 丹江口; pinyin: Dānjiāngkǒu) is a county-level city of northwestern Hubei Province, People's Republic of China. It has a population of more than 150,000 and is under the administration of Shiyan City.
Danjiangkou is located on the Hanshui River. As the city name indicates (Danjiangkou = "the mouth of the Danjiang"), it is located near the mouth of the Dan River (Danjiang).
The city proper is situated near the Danjiangkou Dam on this river.
Danjiangkou is the northwest terminus of the Hankou–Danjiangkou Railway.