| Integrated Middle School Science | Academic & Science |
| Irish Mass Spectrometry Society | Academic & Science |
| Immigrant and Multicultural Services Society | Academic & Science |
| Information Management System for Scholars | Academic & Science |
| Integrated Management Safety Standards | Business |
| Italtel Multi Service Solutions | Business |
| International Mass Spectrometry Society | Business |
| International Marketing Support Scheme | Business |
| Instrumental Music School Services | Community |
| Integrating Middle School Science | Community |
| Interscan Messaging Security Suite | Computing |
| Instituto Mexicano de Seguro Social | General |
| Improved Modular Sleeping System | General |
| Integrated Mapping Surveillance System | General |
| Integrated Market Security System | General |
| Integrated Maritime Surveillance Systems | General |
| International Motorsports Sim Series | General |
| International Motor Sports Show | General |
| Inter-Movement Support System | Governmental |
| Institut Municipal de Serveis Socials | Governmental |
| Institute of Materials Structure Science | Governmental |
| Instituto Mexicano del Seguro Social | International |
| International Museum of Surgical Science | International |
| International Mass Spectrometry School | International |
| International Medical Students Society | International |
| Internet and Management Support for Storage | Internet |
| International Medical Support Services | Medical |
