The R323 road is a regional road in County Mayo, Ireland. Going from west to east, the route connects the towns of Kiltimagh, Knock, and Ballyhaunis. En route it crosses over the N17 national primary road at a grade separated junction in the village of Knock. The official description of the R323 from the Roads Act 1993 (Classification of Regional Roads) Order 2006 reads: The road in southeast County Mayo is 20 km long (map of the road).