| latyan Dam | |
| Name Official: | سد لتیان |
| Location Map: | Iran |
| Coordinates: | 35.7901°N 51.6785°W |
| Dam Crosses: | Jajrood River |
| Purpose: | Water supply, power |
| Status: | Operational |
| Res Capacity Total: | 95000000m2 |
| Location: | Lavasan, Tehran Province, Iran |
| Dam Length: | 450m (1,480feet) |
| Dam Height: | 107m (351feet) |
| Dam Width Base: | 99m (325feet) |
| Construction Began: | 1963 |
| Opening: | 1967 |
| Plant Commission: | 1969/1987 |
| Plant Type: | Conventional |
| Plant Turbines: | 2 x 22.5 MW |
| Plant Capacity: | 45 MW |
| Website: | https://thrw.ir/st/66 |
Latyan Dam (Persian: سد لتيان, also Romanized as Sadd-e Latyān) is a buttress dam on the Jajrood River, located less than 25 km from Tehran in the south of city of Lavasan. It is one of the main sources of water for Tehran metropolitan region. It was constructed between 1963 and 1967. The first generator in the dam's 45 MW hydroelectric power station was commissioned on 17 March 1969, the second on 13 April 1987.[1]
Jajrood River basin is located in the southern part of central Alborz mountain range, the rocks of which date from the Palaeozoic era up to the Quaternary period, as below: