| Index of Financial Inclusion | Business |
| International Fabricare Institute | Business |
| Innovation First, Inc. | Business |
| Industrial Fasteners Institute | Business |
| Islamic Financial Institution | Business |
| International Friendships Inc | Business |
| Industrial Fasteners Inc | Business |
| The International Fund for Ireland | Community |
| Instrumentation Facility Interface | Computing |
| Istituti Finanziari Internazionali | General |
| Instruments For Industry | General |
| Indirect Fuel Injection | General |
| Inline Fuel Injection | General |
| InnerChange Freedom Initiative | General |
| Interns for Indiana | General |
| I Found It | General |
| Internationaler Frauenstudiengang Informatik | General |
| Issued for Information | General |
| Intensive Family Intervention | General |
| Instant File Initialization | General |
| Incremental Fit Index | General |
| I Fix the Issues | General |
| Internal Funding Initiatives | General |
| Internal Funding Initiative | General |
| Illinois Fatherhood Initiative | General |
| Independent Film Initiative | General |
| Idiopathic Fecal Incontinence | General |
| Idiopathic Faecal Incontinence | General |
| Industrial Fastener Institute | Governmental |
| The Institute For Financial Integrity | Governmental |
| Irish Film Institute | Governmental |
| Illinois Family Institute | Governmental |
| Institute for Inquiry | Governmental |
| Insight Foresight Institute | Governmental |
| Issam Fares Institute | Governmental |
| International Federation of Interior | Governmental |
| Institute for Immunology | Governmental |
| Intelligence E Fraud Investigation | Governmental |
| Innovation First International | International |
| International Financial Institution | International |
| International Forwarders Inc | International |
| International Flood Initiative | International |
| Invasive Fungal Infection | Medical |
| Inclusive Fitness Initiative | Sports |
| International Fitness Interest | Sports |
