Banagher is a town in Ireland, located in the midlands, on the western edge of County Offaly in the province of Leinster, on the banks of the River Shannon. The town had a population of 3,000 at the height of its economic growth in the mid-19th century. According to the 2022 census, its population was 1,907. Banagher was historically an important strategic location on the River Shannon and was one of the few crossing points between the provinces of Leinster and Connacht.