| Long Sault 12 | |
| Official Name: | Long Sault Indian Reserve No. 12 |
| Settlement Type: | Indian reserve |
| Pushpin Map: | Canada Ontario |
| Pushpin Mapsize: | 200 |
| Coordinates: | 48.65°N -101°W |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Type2: | District |
| Subdivision Name2: | Rainy River |
| Subdivision Type3: | First Nation |
| Subdivision Name3: | Rainy River |
| Area Land Km2: | 48.16 |
| Population Footnotes: | [1] |
| Population Total: | 0 |
| Population As Of: | 2021 |
| Population Density Km2: | 0 |
| Website: | www.rainyrverfirstnations.com |
Long Sault 12 is a First Nations reserve in northwestern Ontario, Canada. It is one of the reserves of the Rainy River First Nations.