| Abbreviation | Definition |
|---|---|
| IG | International Gymnast |
| IGA | International Grappling Association |
| IGC | International Golf Corporation |
| IGC | International Gymnastic Camp |
| IGCSC | Inaugural Global Congress on Sports and Christianity |
| IGF | Independent Game Festival |
| IGFA | International Game Fish Association |
| IGN | Imagine Gaming Network |
| IGN | International Games Network |
| IGO | Institute of the Great Outdoors |
| IGQ | International Golf Qualifications (New Zealand) |
| IGRN | Inside Gymnastics Radio Network |
| IGS | International Games System |
| IGTBAG | It's Great To Be A Gator! |
| IGTF | Irish Golf Teachers Federation |
| IGW | Inter Galactic Wrestling |
| IHF | Indian Hockey Federation |
| IHF | International Hockey Federation |
| IHG | Inter Hall Games |
| IHL | International Hockey League |