| Official Name: | Aghacullion |
| Irish Name: | Achadh an Chuilinn |
| Country: | Northern Ireland |
| Static Image Name: | File:Farmland west of the Burrenreagh Road at Aghacullion - geograph.org.uk - 2204007.jpg |
| Static Image Width: | thumb |
| Static Image Caption: | Farmland west of the Burrenreagh Road in Aghacullion |
| Map Type: | Northern Ireland |
| Postcode Area: | BT |
| Dial Code: | 028 |
| Lieutenancy Northern Ireland: | County Down |
| Hide Services: | yes |
| Coordinates: | 54.2275°N -5.9511°W |
Aghacullion [1] is a rural townland in County Down, Northern Ireland. It has an area of 223.77 acres (0.91 km2). It is situated in the civil parish of Kilcoo and the historic barony of Iveagh Upper, Lower Half, located miles 2 north-west of Newcastle. It lies within the Newry, Mourne and Down District Council.[2]