| Abbreviation | Definition |
|---|---|
| IBLA | International Baseball League of Australia |
| IBLJ | Intercounty Baseball League of Japan |
| IBLK | Indian Bowling League Kuwait |
| IBLL | Imperial Beach Little League |
| IBM | Inconsiderate Boneheaded Move |
| IBO | International Bowhunter's Organization |
| IBOC | International Bicycle Of Champions |
| IBPA | Israeli Basketball Players Association |
| IBSA | International Blind Sports Association |
| IBTC | I Beat The Children |
| IBU | International Biathlon Union |
| IBW | Italian Bike Weekend |
| IC | Independent Challenge |
| IC | Indoor Cycling |
| ICAT | International Cat Agility Tournament |
| ICBA | Inter-County Basketball Association |
| ICBC | Inter City Bowling Congress |
| ICBM | Inter Continental Boating Machine |
| ICC | International Cricket Council |
| ICC | International Cricket Cup |