The Steavenson River, sometimes incorrectly referred to as Steavensons River, a minor inland perennial river of the Goulburn Broken catchment, part of the Murray-Darling basin, is located in the lower South Eastern Highlands bioregion and Northern Country/North Central regions of the Australian state of Victoria.

The headwaters of the Steavenson River rise on the north–western slopes of the Yarra Ranges, below Mount Edgar and descend to flow into the Acheron River near Buxton.

The flows generally north by west, through rugged national park as the river descends, then north, joined by three tributaries including the Taggerty River, before reaching its confluence with the Acheron River near the settlement of Buxton.

[3] The river is crossed by the Maroondah Highway south of Buxton.

[3] Steavenson Falls, a 122-metre (400 ft) horsetail waterfall located in the upper reaches of the river, descends over five drops, the last having a clear drop of more than 21 metres (69 ft)[4] and is situated approximately 3.4 kilometres (2.1 mi) east of Marysville.