| Abbreviation | Definition |
|---|---|
| IISCO | Indian Iron Steel Company |
| IISCO | Indian Iron & Steel Company |
| IISCO | Industrial Instrument Service Company |
| IISL | Indian Infotech and Software Ltd |
| IISL | International Integrated Solutions Ltd |
| IISP | Independent Internet Service Provider |
| IIT | Intelligent Interface Technologies |
| IIU | Information Investigations Unlimited, Inc. |
| IIUI | Innovative Ideas Unlimited Inc |
| IJC | Indo-Jordan Chemical Company |
| IJC | International Joinstock Company |
| IJD | International Jewellery Dubai |
| IJH | Ingeniørfirmaet Jørgen Hansen |
| IJJP | IJJ Corporation |
| IJNC | Imperium Of Japan News Corp |
| IJR | Ian Johns Racing |
| IJSC | Intercontinental Jet Service Corp |
| IK | Iron Kingdom |
| IKBA | Ike Kligerman Barkley Architects |
| IKEA | Ingvar Kamprad Elmtaryd Agunaryd |