The R809 road is a regional road in three sections in Dublin and Fingal, Ireland. It connects the R807 in Bettyglen to the R105 in Sutton following a roughly semicircular path that runs north, then east, then south, connecting one point on the coast road of Dublin Bay with another point, further northeast. The official definition of the R809 from the Roads Act, 1993 (Classification of Regional Roads) Order, 2012 states: The road is 7.3 km long.