The Ada River is a perennial river of the West Gippsland catchment, located in the West Gippsland region of the Australian state of Victoria.
Ada River rises below Marney Hill, northeast of , in a state forestry area, and flows generally northeast, then south by east, before reaching its confluence with the Latrobe River, north of the Yarra Junction-Noojee Road, west of the locality of in the Shire of Baw Baw. The river descends over its course.
The Ada River sub-catchment area is managed by the West Gippsland Catchment Management Authority.