| Official Name: | Ardaghy |
| Irish Name: | Ard Eachaidh |
| Country: | Northern Ireland |
| Map Type: | Northern Ireland |
| Postcode Area: | BT |
| Dial Code: | 028 |
| Lieutenancy Northern Ireland: | County Down |
| Hide Services: | yes |
| Coordinates: | 54.2486°N -6.0331°W |
Ardaghy [1] is a rural townland in County Down, Northern Ireland. It has an area of 372.6 acres (1.51 km2). It is situated in the civil parish of Kilcoo and the historic barony of Iveagh Upper, Lower Half, located 3.5 miles west of Castlewellan.[2]