| Abbreviation | Definition |
|---|---|
| ISC | Intermodal Service Charge |
| ISC | International Service Center |
| ISC | International Strategic Consulting |
| ISC | International Systems Consultancy |
| ISDB | Islamic Development Bank |
| ISDS | Investor State Dispute Settlement |
| ISE | International Sales Of Electronics |
| ISERD | Israel-Europe R&D Directorate |
| ISERD | Israel-Europe RD Directorate |
| ISI | I Sell International |
| ISIF | Ireland Strategic Investment Fund |
| ISIO | International Security Industry Organization |
| ISM | International Success Mentoring |
| ISM | International Success Motivation |
| IT | International Tendering |
| ITA | International Tin Agreement |
| ITA | International Trade Administration |
| ITAR | International Trade Association Regulations |
| ITAR | International Traffic in Arms Regulations |
| ITC | Indian Tobacco Company |