The Mangangate River, also referred to as the Alabang–Cupang River, is a river system in Muntinlupa, Philippines. It is one of 21 major tributaries of Laguna de Bay. The main stream has a total length of 10 km and has two branches. The first is connected to the drainage system of Ayala Alabang, while the second is connected with the headwater from the New Bilibid Prison (NBP) Reservation, near Camp Sampaguita. This second branch flows through at Ayala Alabang Village and Filinvest City, and connects with the first branch at the Pasong Diablo site, passes through Festival Supermall until it drains out into Laguna de Bay at a point between Wawa, Alabang and Purok 1, Cupang. The river system has four adjoining creeks: The depth of the Mangangate currently varies from 2 to 0.25 m.

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