Devil's Glen Waterfall marks the point where the River Vartry plunges into a dramatic gorge in County Wicklow, roughly 15 km east of Glendalough near the village of Ashford.

The waterfall is the centrepiece of the Devil's Glen forest, where the river has carved a deep ravine through mixed broadleaf and conifer woodland. Before the Vartry Reservoir was constructed in the 1860s, the falls were considerably louder.

The thunderous crash of water echoing through the gorge was said to sound like a "Satanic power announcing some great doom" — the origin of the glen's striking name.

Today the waterfall remains an impressive sight as the river cascades over rocks and rapids before continuing toward the sea.