 TNSLL | |
| Sport | Box lacrosse |
|---|---|
| Founded | 2009 |
| No. of teams | 4 |
| Confederation | First Nations Lacrosse Association |
| Most recent champion(s) | Snake Island Muskies (2023) |
| Most titles | Snake Island Muskies (6) |
| Official website | qslltnsll |
The Three Nations Senior Lacrosse League (TNSLL) is a Senior B box lacrosse league based out of Ontario, Quebec and New York, sanctioned by the First Nations Lacrosse Association (FNLA). The league champion earns a spot in the Presidents Cup, the national championship of Senior B lacrosse in Canada.