| Index of Biological Integrity | Academic & Science |
| Intensive Behavioural Intervention | Academic & Science |
| Iboki | Airport Code |
| Investment Banking Institute | Banking |
| Insurance Brokers of Indiana | Business |
| Intimate Brands, Inc. | Business |
| Information Builders, Inc. | Business |
| International Billboard Identity | Business |
| Interline Brands Inc | Business |
| Inspection Bureau Inc | Business |
| Innovative Business Interiors | Business |
| Investment Builders Inc | Business |
| Iconic Beverages Inc | Business |
| International Broadcasting Institute (later I I C) | Community |
| Illinois Bible Institute | Community |
| In Band Interstitial | Computing |
| Intergovernmental Bureau for Informatics | Computing |
| Internet Based Intervention | Computing |
| Inter-beat Interval | Electronics |
| Intelligence Buildings and Infrastructure | General |
| Intelligent Back-Up Intervention | General |
| Index of Biotic Integrity | General |
| Intensive Behaviour Intervention | General |
| Inquiry Based Instruction | General |
| Information Based Indicia | General |
| International Biochar Initiative | General |
| International Boat Industry | General |
| Inline Bash Interpreter | General |
| International Boat Industy | General |
| Inspiration by imagination | General |
| Instruction by Instruction | General |
| IL BAN IN instead | General |
| I Believe It | General |
| Intensive Behavioral Intervention | General |
| Intralesional Bleomycin Injection | General |
| Industry Business Institute | Governmental |
| International Business Institute | Governmental |
| Integrated Benefits Institute | Governmental |
| Institute of Brazilian Issues | Governmental |
| Institute for Biomedical Informatics | Governmental |
| illegal Bangladeshi immigrant | Governmental |
| Biochar International | International |
| Impuesto sobre Bienes Inmuebles | International |
| International Brake Industries | International |
| Institute for Biotechnology Information | Medical |
| Iboki, Papua New Guinea | Regional |
| Interface Business Intelligence | Softwares |
