The Mehi River is a perennial watercourse that is part of the Barwon catchment within the Murray–Darling basin, located in the Orana district of New South Wales, Australia.
The river rises from the Gwydir River west of Pallamallawa, and flows generally west and west-southwest, joined by eight minor tributaries, before reaching its confluence with the Barwon River near Collarenebri. It descends 82 metres over its 314-kilometre course.
Native fish that are found in the Gwydir-Mehi river system include bony bream, Murray cod, spangled perch, golden perch, which are often known as yellowbelly and eel-tailed catfish.
