The Boyle River is a river in Ireland. Forming part of the Shannon River Basin, it flows from Lough Gara on the Sligo/Roscommon county border and thence through the town of Boyle to Lough Key. From there is continues eastwards through the village of Knockvicar to the River Shannon at Lough Drumharlow, near Carrick-on-Shannon. The length of the Boyle River (from its source in County Mayo to the Shannon) is 64.4 km. The area of its basin is 725 km2.
