| Abbreviation | Definition |
|---|---|
| ICCT | International Catamaran Challenge Trophy |
| ICE | Integrated Climbing Equipment |
| ICE | Intensity, Consistency, Efficiency |
| ICF | International Federation of Cheerleaders |
| ICHR | International Champagne Horse Registry |
| ICL | Indian Cricket League |
| ICMBC | Imperial College Medics Boat Club |
| ICON | Inside Comfort, Outside Nature |
| ICS | Internet Chess Server |
| ICSD | International Committee of Sports for the Deaf |
| ICSF | International Casting Sport Federation |
| ICSF | Italian Canadian Sports Federation |
| ICSL | Inter-County Soccer League |
| ICW | Italian Championship Wrestling |
| IDA | Intercollegiate Dressage Association |
| IDBA | International Deaf Basketball Association |
| IDBA | International Drag Bike Association |
| IDBF | International Dodge Ball Federation |
| IDBF | International Dragonboat Federation |
| IDBL | IASCA (International Auto Sound Challenge Association) Decibel League |