The La Ngà River (Vietnamese: Sông La Ngà) is a river of southern Vietnam. It originates in Lâm Đồng Province and flows through Bình Thuận Province and Đồng Nai Province for 272 kilometres. The river has a basin area of 4710 km². It is a major tributary of Đồng Nai River, which it joins at Trị An Lake, and therefore part of one of the largest river systems in Vietnam. One of its tributaries in Bình Thuận Province supports a hydro-power plant, the Hàm Thuận – Đa Mi Hydroelectric Power Complex.