| IRMS | Icicle River Middle School 
| Others |
| IRMS | Illinois Risk Management Services
| Others |
| IRMS | Indian Railways Management Services
| Others |
| IRMS | Indian Ridge Middle School
| Others |
| IRMS | Indian River Middle School
| Others |
| IRMS | Information and Records Management Society
| Others |
| IRMS | Information Request Management System
| Others |
| IRMS | Information Resource Management Services
| Others |
| IRMS | Information Resources Management Service
| Others |
| IRMS | Institute for Reproductive Medicine and Science
| Others |
| IRMS | Institute for Research on Male Supremacism
| Others |
| IRMS | Insurance and Risk Management Services
| Others |
| IRMS | Integrated Revenue Management System
| Others |
| IRMS | Integrated Risk Management Services
| Others |
| IRMS | Integrated Risk Management Solution
| Others |
| IRMS | Integrated Risk Management System
| Others |
| IRMS | Iowa Religious Media Services
| Others |
| IRMS | Isotope Ratio Mass Spectrometer
| Others |
| IRMS | Isotope Ratio Mass Spectrometers
| Others |
| IRMS | Isotope ratio mass spectrometry
| Others |
| IRMS | Isotope Ration Mass Spectrometry
| Others |