Brosna (Irish: An Bhrosnach) is a hamlet in County Offaly, Ireland. It lies in the valley of the Little Brosna River less than one kilometer off the N62 national secondary road. Brosna is deceptive in appearance;the main road through the village is home to families that have been here for several generations.Farming families and a thriving Plumbing business operate in and around the hamlet. Like all rural areas in Ireland Brosna has some neglected old houses but residents manage to give the place a pretty look with the use of hanging baskets and planted flowers on the bank of the stream that flows through it.