Ballymahon
| Ballymahon Baile Uí Mhatháin | |
|---|---|
| Town | |
| Ballymahon | |
| Coordinates: 53°34′00″N 7°46′00″W / 53.566667°N 7.766667°W | |
| Country | Ireland | 
| Province | Leinster | 
| County | County Longford | 
| Elevation | 82 m (269 ft) | 
| Population  (2022) | 1,714 | 
| Time zone | UTC+0 (WET) | 
| • Summer (DST) | UTC-1 (IST (WEST)) | 
| Eircode routing key | N39 | 
| Telephone area code | +353(0)90 | 
| Website | ballymahontown | 
Ballymahon (Irish: Baile Uí Mhatháin, meaning 'Mahon's town') on the River Inny is a town in the southern part of County Longford, Ireland. It is 19 km north-east of Athlone, at the junction of the N55 and R392 roads.