| Abbreviation | Definition |
|---|---|
| IOS | International Online Soccer |
| IPSL | Iowa Premier Soccer League |
| IRSA | Indian River Soccer Association |
| ISA | Iowa Soccer Association |
| ISB | International Soccer Bank |
| ISCA | Indiana Soccer Coaches Association |
| ISCA | Indoor Soccer Coaches Association |
| ISL | Indiana Soccer League |
| ISL | Iowa Soccer League |
| ISLE | Integrated Soccer Learning Environment |
| ISOA | Intercollegiate Soccer Officials Association |
| ISRC | Illinois Soccer Referee Committee |
| ISS | Improving Soccer Sportsmanship |
| ISS | International Superstar Soccer |
| ISSE | International Soccer School of Excellence |
| ISSL | Inter-Societies Soccer League |
| ISTA | International Soccer Training Academy |
| ITSF | International Table Soccer Federation |
| IYS | Indiana Youth Soccer |
| JAGS | Jersey Area Girls Soccer |