| Abbreviation | Definition |
|---|---|
| ICSPA | Independent Closely Spaced Parallel Approaches |
| ICSR | International Centre for the Study of Radicalisation (London, UK) |
| ICST | International Communication Sciences and Technology Association |
| ICSW | International Committee on Seafarers' Welfare |
| ICT | Institute for Counter-Terrorism |
| ICT | International Campaign for Tibet |
| ICTD | International Campaign for Tibet Deutschland, e. V. |
| ICTE | International Campaign for Tibet Europe |
| ICTF | International Credit & Trade Finance Association |
| ICTSD | International Centre for Trade and Sustainable Development |
| ICWG | Information Commons Project Working Group |
| ICYE | Inter Cultural Youth Exchange |
| IDA | In Defense of Animals |
| IDA | Interactional Disorders Association |
| IDA | International Dark-Sky Association |
| IDA | International Day of Action |
| IDA | International Development Association |
| IDA | International Dyslexia Association |
| IDA | Invisible Disabilities Advocate |
| IDARS | International Drug Abuse Research Society |