| Owenmore River | |
| Mouth Coordinates: | 54.1903°N -8.4836°W |
| Subdivision Type1: | Country |
| Length: | 52.3km (32.5miles) |
| Source1 Elevation: | 125m (410feet) |
| Basin Size: | 655km2 |
The Owenmore River (Irish: An Abhainn Mhór) is a river in County Sligo, Ireland. Its source is in the far south of Sligo, near Gorteen and Lough Gara, from which it runs for 52.3 km to its juncture with the Unshin River near Collooney to form the Ballisodare River. Its catchment covers 655km2, predominantly located in Sligo but with small parts in County Mayo and County Roscommon. The catchment is underlain by limestone, and the total length of all the rivers in the Greater Owenmore Basin Area is . There are approximately 1470ha of lakes in the catchment, with Lough Arrow comprising most of this.[1]