| Rank | Abbreviation | Meaning |
|---|
| ***** | MIRT | Major Incident Response Team
| |
| **** | MIRT | Mobile Infrared Transmitter
| |
| **** | MIRT | Multi-Functional Independent Review Team
| |
| **** | MIRT | Maximal Increase in Resting Tension
| |
| **** | MIRT | Marine Incident Response Team
| |
| *** | MIRT | Maritime Incident Response Team
| |
| *** | MIRT | MSP (Major Surface Protease) Intergenic Region RFLP (Restriction Fragment Length Polymorphism) Typing
| |
| *** | MIRT | Maryland Interfaith Recovery Team
| |
| ** | MIRT | Minority International Research Training
| |
| ** | MIRT | Movement for Islamic Revival in Tajikistan
| |
| * | MIRT | Mobile Infra-Red Transmitter
| |
| * | MIRT | Myeloma Institute for Research and Therapy
| |
| * | MIRT | Materials Interdisciplinary Research Team
| |
| * | MIRT | MATRIS Indexing and Retrieval Thesaurus
| |
| * | MIRT | Malware Incident Reporting and Termination
| |
| * | MIRT | Médecin Inspecteur Régional du Travail
| |
| * | MIRT | Medical Industry Round Table
| |
| * | MIRT | Multidisciplinary International Research Training
| |
| * | MIRT | Minority Institutional Research Training
| |