Clywedog may refer to:
Afon Clywedog, a tributary of the River Severn at Llanidloes River Clywedog, a tributary of River Dee near Wrexham A tributary of the Afon Wnion in Gwynedd Clywedog Reservoir, a reservoir in Powys River Clywedog, Denbigh, a tributary of the River Clwyd Clywedog Brook, Powys, a tributary of the Wye.
See also Clydach (disambiguation)