| Abbreviation | Definition |
|---|---|
| IDCL | Indo Dutch Cricket League |
| IDF | International Dart Federation |
| IDFA | International Drug Free Athletics |
| IDKC | Irish Deaf Karting Club |
| IDKF | Imperial Dragon Kung Fu |
| IDP | Individual Defensive Player |
| IDPA | International Defensive Pistol Association |
| IDRA | Island Drag Racing Association |
| IDRC | Import Drag Racing Circuit |
| IDTA | International Dance Teacher Association |
| IDTP | Ironman Distance Training Program |
| IEP | Index of Effective Participation |
| IEPT | Interactive Entertainment Poker Tour |
| IETN | Intermediate Eastside Tennis Network |
| IEWA | Inland Empire Wrestling Assocation |
| IF | Infielder |
| IFA | Inter Futbol Academy |
| IFA | Irish Football Association |
| IFAB | International Football Association Board |
| IFBC | Indiana's Finest Black Cat Invitational |