River Geirionydd

Geobox|River
name = River Geirionydd
native_name = Afon Geirionydd
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image_size = 250px
image_caption = The River Geirionydd near Klondyke mill
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country = Wales | country_

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source_name = Llyn Geirionydd
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mouth_name = confluence with Afon Crafnant
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map_caption = The River Geirionydd ("Afon Geirionydd" in Welsh) is a river in Snowdonia, North Wales. It is a tributary of the River Crafnant ("Afon Conwy"), which flows into the River Conwy ("Afon Conwy"), which is the main river of the Conwy valley.

It flows from Llyn Geirionydd down a steep gorge before joining the river Crafnant. It is less than a mile in length.

The river passes the former Klondyke Mill, which used its waters. Klondyke was a mining and milling complex connected with some of the metal mines of the Gwydir Forest by means of a tramway which ran alongside Llyn Geirionydd. From above the Mill wagons used to enter the building via an aerial ropeway.