| Abbreviation | Definition |
|---|---|
| IHOA | Illinois Hockey Officials Association |
| IHSA | Iate Horse Show Association |
| IHSB | Indiana High School Bowling |
| IHT | In House Tourney |
| IIHL | International Ice Hockey Federation |
| IIS | Interactive Internet Sports |
| IIS | International Island Sportsbook |
| IISA | Imperial International Sports Academy |
| IISF | Israel Ice Skating Federation |
| IJA | I Jump Anyone |
| IKE | Indoor Karting Experience |
| IKF | International Kart Federation |
| IKF | International Karting Federation |
| IKO | International Karate Organisation |
| ILC | International Level Class |
| ILC | International Lightning Class |
| ILCA-NA | International Laser Class Association North American Region |
| ILP | Inter League Play |
| ILSC | Iron Lakes Sports Club |
| ILTF | International Lawn Tennis Federation |