| Abbreviation | Definition |
|---|---|
| IBC | Intercollegiate Bowling Championship |
| IBC | International Board Competition |
| IBCA | Illinois Basketball Coaches Association |
| IBF | Illinois Bass Federation |
| IBF | Internatinal Balint Federation |
| IBF | International Badminton Federation |
| IBF | International Balot Federation |
| IBF | International Baseball Federation |
| IBF | International Bobsled Federation |
| IBF | International Boxing Federation |
| IBF1 | International Baseball Federation 1 |
| IBF2 | International Baseball Federation 2 |
| IBFC | Illini-Badger Football Conference |
| IBFL | Insee Basketball Fantasy League |
| IBFL | Inter-Bank Football League |
| IBFN | Illinois B.A.S.S. Federation Nation |
| IBFN | International Big Fish Network |
| IBHL | Ismaili Ball Hockey League |
| IBL | Intercounty Baseball League |
| IBLA | Illinois Boys Lacrosse Association |