The River Dargle is a whitewater river in County Wicklow, Ireland, draining the northern slopes of Djouce Mountain in the Wicklow Mountains before reaching the Irish Sea at Bray Harbour. The paddleable section is approximately 4 kilometres long and is graded 4 to 5 by Irish Whitewater, placing it firmly in the advanced to expert category.

The river's most prominent feature is a major falls — referred to in paddling accounts as "the main falls" — which has been run at gauge levels around 6 blocks and higher. Paddlers use a block-based gauge system at the take-out bridge to assess runnability, with levels in the 5 to 5.5 block range described as providing a quality run with sufficient water while still allowing eddy access above the main drop. At lower levels the river becomes noticeably more technical and bony.

The Dargle catchment covers approximately 128 square kilometres, with the upper river flowing through terrain characterised by granite, slate, shale, and schist geology. The upper reaches pass through forested valley sections before the gradient increases through the main whitewater. The take-out is at a bridge. Upstream, the river flows beneath Powerscourt Waterfall — Ireland's highest at 121 metres — which represents an obvious and absolute hazard requiring portage or avoidance depending on the chosen run section.

Given the Grade 4-5 classification, the Dargle is not appropriate for intermediate paddlers and should only be attempted by those with solid advanced whitewater skills and familiarity with Irish spate rivers. Like most Irish mountain rivers, it is rain-dependent and runs best following significant rainfall.