| Integrity & Reliability Engineering Service WLL | Conglomerates |
| InterContinental Doha | Leisure and Tourism |
| Intergroup Shipping WLL | Transport |
| Intergroup W.L.L | Oil and Gas |
| Intermodal Services Co WLL Qatar | Conglomerates |
| International Bank of Qatar Q.S.C. | Financial Services |
| International Centre for Sport Security | Education |
| International Company for Advanced Systems - Qatar | Information Technology |
| International Financial Securities Company Q.S.C | Financial Services |
| International Financial Services (QA) | Financial Services |
| International Gulf Trading Company Chubb Fire Qatar | Industrial Manufacturing |
| International Legal Consultants LLC | Services |
| International Projects Development Company | Construction |
| International Riders WLL | Transport |
| International Security Consultancy Group Gulf WLL | Industrial Manufacturing |
| International Trading & Technical Services Company WLL | Telecommunications |
| International Union of Muslim Scholars | Governmental Institutions |
| Intertec Group W.L.L | Telecommunications |
| Investment Holding Group Q.P.S.C. | Financial Services |
| Investment House | Financial Services |
| InveTrack Consulting | Services |
| Islamic Financial Securities Company (W.L.L.) | Financial Services |
| Islamic Online University | Education |
| Ismail Bin Ali Group | -- |
| IT Linx Information Technology | Information Technology |
