| Acronym | Definition |
|---|
| MRI | Magnetic Resonance Imaging |
| MRI | Mauritius |
| MRI | Medical Research Institute (dietary supplements; San Francisco, CA) |
| MRI | Midwest Research Institute |
| MRI | Manchester Royal Infirmary |
| MRI | Mitsubishi Research Institute (Japan) |
| MRI | Medium Resolution Instrument |
| MRI | Max Rubner-Institut (German research institute) |
| MRI | Ministry of Research and Innovation (Canada) |
| MRI | Medical Records Institute |
| MRI | Medical Resources, Inc. (various locations) |
| MRI | Mineral Resources International (Ogden, UT) |
| MRI | Major Research Instrumentation Program (National Science Foundation) |
| MRI | Meteorological Research Institute |
| MRI | Management Recruiters International |
| MRI | Monitor Line for Rings |
| MRI | Machine Readable Information |
| MRI | Mediamark Research, Inc. |
| MRI | Molecular Research Institute (est. 1979; California) |
| MRI | Major Research Initiative |
| MRI | Matz's Ruby Interpreter (computer programming) |
| MRI | Material Research Institute (Pennsylvania State University) |
| MRI | Mathematics Research Institute (various locations) |
| MRI | Mean Recurrence Interval (engineering measurement) |
| MRI | Migrants' Rights International (Switzerland) |
| MRI | Mixed Reality Interface |
| MRI | Magnetorotational Instability (physics) |
| MRI | Management Reports International |
| MRI | Moores Rowland International (accounting; Taiwan) |
| MRI | Mexican Restaurants, Inc. (Houston, TX) |
| MRI | Most Recent Interim (finance) |
| MRI | Metallurgy Research Institute (Zimbabwe) |
| MRI | Mean Return Interval (hurricances) |
| MRI | Managing Retirement Income (class & conference) |
| MRI | Mediamark Research Intelligence |
| MRI | Medical Reengineering Initiative |
| MRI | Market Research, Inc. (New York) |
| MRI | Measurement Recording Instrument (Hale Propeller, LLC) |
| MRI | Member of the Royal Institution (of Great Britain; London) |
| MRI | Missouri River Institute |
| MRI | Montgomery Research, Inc. (San Francisco, CA) |
| MRI | Myers Research Institute |
| MRI | MODERATE RISK OF ISOLATION |
| MRI | Master Record Index |
| MRI | Multi-Resolution Integration (algorithm) |
| MRI | Market Research Indonesia |
| MRI | Machine Readable Instruction |
| MRI | Marginal Reliability Importance |
| MRI | Michigan Retail Index |
| MRI | MILSTRIP Routing Identifier |
| MRI | Maryland Rock Industries, Inc. |
| MRI | Magnum Research Incorporated |
| MRI | Material Receipt Inspection |
| MRI | Morning Room Inspection |
| MRI | Maintenance Requirements - Instruments |
| MRI | Material Requirement Internal |
| MRI | Morrison Research Initiative |
| MRI | Mission Readiness Inspection (USAF) |
| MRI | Mail Routing Instruction (US DoD) |
| MRI | Miyabi Research Institute (Japan) |