Rangit Dam (Hindi: रन्गीत् बाँध Bāndh), which forms the headworks of the Rangit Hydroelectric Power Project Stage III, is a run-of-the-river hydroelectric power project on the Ranjit River, a major tributary of the Teesta River in the South Sikkim district of the Northeastern Indian state of Sikkim.

At the dam site, the catchment area drained is 979.02 square kilometres (378.00 sq mi) (rain-fed catchment is 712 square kilometres (275 sq mi) and the balance area is snow fed above snow line contour of (4,570 metres (14,990 ft)); elevation of the catchment area varies from about 600 metres (2,000 ft) to about 7,338 metres (24,075 ft) (North Kabru Peak) and is delimited between (27°16′30″N 88°00′51″E / 27.275°N 88.0141°E / 27.275; 88.0141) and (27°37′10″N 88°25′12″E / 27.6195°N 88.42°E / 27.6195; 88.42).

The dependable discharge adopted for diversion from the reservoir for power generation is 1717.8 cubic metres (630 cu ft)/s (without considering contribution from the upstream Stage II project, which is yet to be implemented).

The banks of the Rangit River depict silty clay material with large rock blocks.

The storage created is utilized for hydropower generation at a surface Powerhouse located on the left bank of the Rangit River.

The tailwaters from the turbines are led back into the river through a combined short tailrace channel.

[7] The project was funded by the Government of India and built by its parastatal organization namely, the National Hydroelectric Power Corporation (NHPC).

[8][9][10] In river valley reservoir projects, the gravity of the siltation problem induced due to catchment degradation is serious and needs to be suitably addressed.

15 nurseries were established covering an area of 18.5 hectares (46 acres)) to provide saplings/seedlings for plantation in the sub-watersheds of the catchment identified for treatment.

The recreational centre was developed due to the initiative of the local people of Legship town.