| Abbreviation | Definition |
|---|---|
| IRTI | Integrated Resource Technologies Inc |
| IRZK | InterimRegeling ZiekteKosten |
| IS | Infinity Systems |
| ISARC | India SME Asset Reconstruction Company |
| ISB | Ice Skating Bay |
| ISB | Information Systems Branch |
| ISB | Insurance Search Bureau |
| ISB | International Syndicate of Business |
| ISBA | Imprinted Sportswear Business Alliance |
| ISBA | Indian STEP and Business Incubators Association |
| ISBC | International Small Business Consortium |
| ISBC | Iraqi-Swedish Business Centre |
| ISBE | Institute for Small Business and Entrepreneurship |
| ISBG | Innovative Solutions Business Group |
| ISBG | Integrated Solutions for Business and Government, Inc. |
| ISBL | Immigration Solutions Bureau Ltd |
| ISBS | Image Systems and Business Solutions Corporation |
| ISBS | International Specialized Book Services |
| ISBU | Internet Systems Business Unit |
| ISC | Importers Service Corporation |