| Invesco Pty | Business |
| Itemized Price Index | Business |
| Intrepid Potash Inc | Business |
| Investment Professionals Inc | Business |
| International Pharmaceuticals Inc | Business |
| I P C Communication, Inc., of Delaware | Business |
| International Parking Institute | Business |
| Income Protection Insurance | Business |
| Impressive Products, Inc. | Business |
| International Payment Instruction | Business |
| Instructional Practices Inventory | Community |
| Intelligent Peripheral Interface | Computing |
| Inter Processor Interrupt | Computing |
| Initial Protocol Identifier | Computing |
| Image Processing and Interchange | Computing |
| Intel Product Integrator | Computing |
| Internal Processor Interrupt | Computing |
| i-Predator Probability Inventory | Computing |
| In Process Inspection | General |
| Interested Parties Information | General |
| Interactive Pipe Inspection | General |
| Illumination Publishers International | General |
| Individual Programmed Instruction | General |
| Independent Photo Imagers | General |
| Integrated Pulmonary Index | General |
| Internal Packet Identifier | General |
| Iowa Prison Industries | General |
| Inputs Process Image | General |
| Inwald Personality Inventory | Governmental |
| Indigenous Populations and Institutions | Governmental |
| Institute for Private Investors | Governmental |
| International Psychotherapy Institute | Governmental |
| Image Permanence Institute | Governmental |
| International Peace Institute | Governmental |
| Institute for Policy Innovation | Governmental |
| International Press Institute | Governmental |
| Indian Plastics Institute | Governmental |
| Ikatan Pemuda Indonesia | International |
| Índice de Producción Industrial | International |
| International Prognostic Index | International |
| International Protection Investigation | International |
| International Partnering Institute | International |
| International Pharmaceutical Industry | Medical |
