Long Harbour-Mount Arlington Heights
| Long Harbour–Mount Arlington Heights | |
|---|---|
| Town | |
| Location of Long Harbour–Mount Arlington Heights in Newfoundland | |
| Coordinates: 47°25′46″N 53°51′30″W / 47.42944°N 53.85833°W | |
| Country | Canada | 
| Province | Newfoundland and Labrador | 
| Population  (2021) | |
|  • Total | 185 | 
| Time zone | UTC-3:30 (Newfoundland Time) | 
| • Summer (DST) | UTC-2:30 (Newfoundland Daylight) | 
| Area code | 709 | 
| Highways | Route 101 Route 202 | 
Long Harbour–Mount Arlington Heights is a town in the Canadian province of Newfoundland and Labrador. The town had a population of 185 in the Canada 2021 Census.
The town is the site of the Long Harbour Nickel Processing Plant.