Watergrasshill (Irish: Cnocan na Biolrai) is a small town in County Cork, Province of Munster, Ireland. The 2006 census recorded a population of 1,068. Bypassed in 2003, the town is situated on the R639 road. It is accessible via junction 17 of the M8 motorway. The National Ploughing Championships were held here in 1974 and 1979. watergrasshill used to be called watercresshill