| IEMS | Illini Emergency Medical Services 
| Others |
| IEMS | Indianapolis Emergency Medical Services
| Others |
| IEMS | Industrial Engineering and Management Sciences
| Others |
| IEMS | Industrial Engineering and Management Systems
| Others |
| IEMS | Informal Economy Monitoring Study
| Others |
| IEMS | Innovation and Entrepreneurship Measurement System
| Others |
| IEMS | Installation Equipment Management System
| Others |
| IEMS | Integrated Emergency Medical Service
| Others |
| IEMS | Integrated Enterprise Management System
| Others |
| IEMS | Integrated Environmental Media System
| Others |
| IEMS | International Environmental and Marine Services
| Others |
| IEMS | Internet Exchange Messaging Server
| Others |
| IEMS | intranet Environmental Management System
| Others |