The Grey River is a perennial river of the Corangamite catchment, located in the Otways region of the Australian state of Victoria.
The Grey River rises in the Otway Ranges in southwest Victoria and flows generally east by south towards the town of Grey River where the river reaches its mouth and empties into Addis Bay, part of Bass Strait, north of Cape Otway. From its highest point, the river descends 491 metres (1,611 ft) over its 9-kilometre (5.6 mi) course.[2]