| Abbreviation | Definition |
|---|---|
| IBSA | IL Baptist State Association |
| IBSA | Independent Builders Supply Association |
| IBSA | International Beauty Sharpening Association |
| IBSA | International Bergamasco Sheepdog Association |
| IBSA | International Business Structuring Association |
| IBTA | International Baton Twirling Association |
| ICA | Idaho Cowboys Association |
| ICA | Illinois Counseling Association |
| ICA | International Carwash Association |
| ICA | International Caterers Association |
| ICA | International Chiropractors Association |
| ICA | International Clarinet Association |
| ICA | International Cluttering Association |
| ICA | International Copper Association |
| ICA | Internet Commerce Association |
| ICAA | International Colored Appaloosa Association |
| ICAA | Iowa Community Action Association |
| ICAA | Iowa County Attorneys Association |
| ICAP | Inland Counties Association of Paralegals |
| ICATA | International Cognitive Analytic Therapy Association |