| Abbreviation | Definition |
|---|---|
| ISMG | Information Security Media Group |
| ISMI | Integrated Systems Management Inc |
| ISNoA | Insurance Sales Network of America |
| ISO | Insurance Services Office |
| ISO | Insurance Services Office, Inc. |
| ISO | Insurance Services Office, Incorporated |
| ISOG | Information Security Officers Group |
| ISP | Internet Service Provider |
| ISPA | Internet Service Providers Association |
| ISPG | Independent School Performance Group |
| ISPL | Ideal Systems Pvt Ltd |
| ISPL | Imperial Soft Pvt Ltd |
| ISPL | International Scientific Pte Ltd |
| ISPL | Ispl Systems Private Limited |
| ISRGT | ISR Global Telecom |
| ISS | Information Systems and Services |
| ISSA | International Ship Suppliers Association |
| ISSC | IBM Solution & Service Company |
| ISSC | Industrial Safety Supply Corp |
| ISSC | Innovative System Solutions Corporation |