| Undowah River | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Australia |
| Subdivision Type2: | State |
| Subdivision Name2: | New South Wales |
| Subdivision Type3: | Region |
| Subdivision Name3: | South Eastern Highlands (IBRA), Monaro |
| Subdivision Type5: | Local government areas |
| Subdivision Name5: | Snowy Monaro Regional Council |
| Length: | 21km (13miles) |
| Source1: | Thoko Hill |
| Source1 Location: | southwest of Bemboka |
| Source1 Elevation: | 1030m (3,380feet) |
| Mouth: | confluence with the Bombala River |
| Mouth Location: | near Bibbenluke |
| Mouth Elevation: | 731m (2,398feet) |
| River System: | Snowy River catchment |
| Tributaries Left: | Grassy Flat Creek |
| Custom Label: | National park |
| Extra: | [1] |
The Undowah River, a perennial river of the Snowy River catchment, is located in the Monaro region of New South Wales, Australia.
The Undowah River rises on the southern slopes of Thoko Hill, near the locality of Bellevue, southwest of Bemboka. The river flows generally south by west, joined by one minor tributary before reaching its confluence with the Bombala River near the village of Bibbenluke, northeast of Bombala. The river descends over its course.[1]