| Sport | Indoor football |
|---|---|
| Founded | 2015 |
| Founder | Barbara Spigner (SIF) |
| CEO | Barbara Spigner |
| No. of teams | 1 |
| Country | United States |
| Most recent champion(s) | Cape Fear Heroes (1st title) |
| Most titles | Cape Fear Heroes (1 title) |
| Official website | SupremeIndoorFootball.com |
Supreme Indoor Football (SIF) is an inactive professional indoor football league based in the Southeastern United States.
The SIF was originally the creation of the Cape Fear Heroes ownership. During the league's initial launch in 2015, it was to be part of the Indoor Football Alliance, which would have also included a revived Continental Indoor Football League and begun play in 2016. When the CIFL revival never materialized, and the league had difficulties in finding teams to join the league, the Heroes suspended operations, effectively suspending the league as well. The league launched on its second attempt in April 2017. It played one season before its members joined the newly formed American Arena League. Commissioner Barbara Springer then announced she wanted to turn the SIF into a developmental summer league.[1]