The Langat River is a river in Selangor state of Malaysia. The Langat is 78 km long, with a catchment of 2350 km2, and originates from the Titiwangsa Range at Gunung Nuang. It drains westward to the Straits of Malacca. The major tributaries of the Langat River are the Sungai Semenyih and Sungai Labu.