| Semenyih Dam | |
| Location: | Hulu Langat District, Selangor, Malaysia |
| Coordinates: | 3.0856°N 101.8892°W |
Semenyih Dam (Malay: Empangan Semenyih) is a dam in Hulu Langat District, Selangor, Malaysia. Built in 1985, the dam, with its lake surrounded by green forested hills, provides one of the most breathtaking sights in the country. It also supplies a major portion of drinking water to the Klang Valley population. Semenyih Dam is popular with angling enthusiasts, especially on weekends.