 FNJBLL | |
| Sport | Box lacrosse |
|---|---|
| Founded | 2014 |
| First season | 2014 |
| Commissioner | Mark Brant |
| No. of teams | 6 |
| Country | United States Canada |
| Most recent champion(s) | Onondaga Jr. Redhawks (2024) |
| Most titles | Seneca WarChiefs (6) |
| Domestic cup(s) | Founders Cup |
The First Nations Junior B Lacrosse League (formerly Iroquois Nations Junior B Lacrosse League) is a box lacrosse league sanctioned by the First Nations Lacrosse Association. The league was formed in 2014 with the restructuring of the Canadian Lacrosse Association. Four teams competed in the inaugural season.
The league winner earns a spot in the Founders' Cup, the national championship of Junior B lacrosse in North America.