| Indian National Students Association (INSA-UK) CIC |
| Indiana Packers Corp |
| Inditex Group |
| Indus Valley School of Art and Architecture |
| Infinity Foods Co-operative Limited |
| Influence Digital |
| Ingka Holding B.V |
| Initiative for Heritage Conservation |
| Injaro Investments Limited |
| Innovate UK |
| Innovation 1st |
| Innovation Partners |
| Insaan Culture Club |
| Inspera AS |
| Inspirate |
| Inspired Pet Nutrition Limited (was Wagg Foods Ltd) |
| Instagram LLC |
| Institut Pedagogique National de I’Enseignement Technique et Professionel |
| Institute for Strategic Dialogue |
| 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) |