The R826 is a suburban secondary road in the Dublin suburb of Dundrum. It runs north from junction 13 of the M50 to the R112 Taney Road.
The route – S2 apart from a central 320-metre stretch which is S4 including bus lanes – is largely new build dating from the early 2000s. At roughly the 2-kilometre point of its course the R826 passes the "Dundrum Town Centre" shopping centre, Ireland's largest.
Prior to the Declaration of Regional Roads Order of 13 April 2006 the R826 had been described as running from the R825 at Kilmacud Road Lower to the R113 at Harold's Grange Road.