The Yalmy River is a perennial river of the Snowy River catchment, located in the Alpine region of the Australian state of Victoria.

The Yalmy River rises in a valley in a remote alpine wilderness area that forms the boundary between the Snowy River National Park and the Yalmy State Forest, and flows generally south, then west, then south, then south by west, joined by three minor tributaries, before reaching its confluence with the Rodger River east of Hicks camp site within the national park in the Shire of East Gippsland. The river descends 315 metres (1,033 ft) over its 28-kilometre (17 mi) course.

The entire course of the river is contained within, or forms the eastern boundary of the Snowy River National Park.

The traditional custodians of the land surrounding the Yalmy River are the Australian Aboriginal Bidawal and Nindi-Ngudjam Ngarigu Monero peoples.

• List of rivers of Australia

• "Snowy River National Park: park notes" (PDF). Parks Victoria. November 2013.
• "Snowy River sub-catchment". East Gippsland Catchment Management Authority. Government of Victoria.
• "Snowy River - Catchment Map" (map). East Gippsland Catchment Management Authority. Government of Victoria.
• East Gippsland Catchment Management Authority (2013). East Gippsland regional catchment strategy 2013 -2019 (PDF). Bairnsdale: East Gippsland Catchment Management Authority. ISBN 978-0-9758164-6-2.