Flahavan's is an Irish milling company which has been run by the Flahavan family since about 1785 located in the village of Kilmacthomas. The current chairman is John Flahavan. The original mill was a watermill driven by the River Mahon in Kilmacthomas, County Waterford. The Flahavan's factory now produces other items alongside its traditional porridge oats including oats-based breakfast cereals, rolled oats, cereals, muesli, flour, snack products, and baked oat products such as flapjacks and biscuits. Flahavan's turnover reached €29.3m in 2022, up from €27.7m in the prior year.