| Institute of African and Asian Studies |
| Institute of Business Management |
| Institute of Contemporary Arts Limited |
| Institute of Development Affairs (IDEA) |
| Institute of Development Studies |
| Instituto de Responsabilidade e Investimento Social (IRIS) |
| Instituto Febre |
| Instituto Profesional Chileno Británico de Cultura |
| Intact Financial Corporation |
| Integra Business Solutions Limited |
| Integrated Asset Management |
| Integrated Whale Media Investment Inc. |
| Intel Corporation |
| Intelligent Facility Group |
| Intelligent Facility Solutions |
| Intelys |
| Interactive Investor Services Limited |
| International Academy of Iraq |
| International Consolidated Airlines Group SA [ALSO: International Airlines Group] |
| International Documentary Festival Sheffield [ALSO: Sheffield DocFest] |
| International Education Association of South Africa |
| International Greenscents Ltd |
| International Holdings Company P.J.S.C. |
| International House Trust |
| International House World Organisation Limited |