River Machno (Welsh: Afon Machno) is a river in Snowdonia in north-west Wales. It is the first major tributary of the River Conwy, which it joins south of Betws-y-coed, past the Pandy Falls and the Machno Falls.

River Machno
The River Machno at Pont Rhyd-y-Gro
Native name	Afon Machno  (Welsh)
Location
Country	Wales
Physical characteristics
Mouth
• location	Confluence with River Conwy

It has its source in the slopes at the head of the Machno valley, and flows through the villages of Cwm Penmachno and Penmachno.