The R117 road is a regional road in Ireland. The route (north-south) starts Harcourt Road at the end of the South Circular Road on the southside of Dublin city centre. It crosses the Grand Canal and goes through the suburbs of Ranelagh, Milltown, Windy Arbour, Dundrum, Sandyford, Stepaside and Kilternan before passing through the Scalp into County Wicklow.