Bang Lang Reservoir (Thai: อ่างเก็บน้ำบางลาง) is a reservoir in Bannang Sata District, Yala Province, southern Thailand. The reservoir is on the Pattani River.

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Bang Lang Reservoir
Bang Lang Reservoir
Location	Yala Province
Coordinates	6°9′20″N 101°16′25″E
Type	Reservoir
Primary inflows	Pattani River
Primary outflows	Pattani River
Basin countries	Thailand
Built	1981
Max. width	1.92 miles (3.09 km)
Water volume	1,420 million cubic metres (1,150,000 acre⋅ft)
Islands	numerous islands and islets

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The reservoir's dam, Bang Lang Dam, is 85 metres high with a crest of 422 metres long, and the reservoir has a capacity of 1,420 million cubic metres. It is used for irrigation and flood control as well as to produce 72 MW of electricity.^[1]

Construction of the dam was approved on 3 April 1973. Construction started in July 1976. In June 1981 the dam was completed. It was officially inaugurated on 27 September 1981 by Princess Maha Chakri Sirindhorn.

The reservoir submerged the village of Ban Toh.^{[citation needed]} In 2016, declining water levels caused the village remains to resurface.^{[2][better source needed]}