| Acronym | Definition |
|---|
| MIR | Mail(ed) in Rebate |
| MIR | Music Information Retrieval |
| MIR | Mid Infrared |
| MIR | Multimedia Information Retrieval |
| MIR | Maryland International Raceway |
| MIR | Movimiento de la Izquierda Revolucionaria (Spanish: Movement of the Revolutionary Left; Bolivia) |
| MIR | Micropower Impulse Radar |
| MIR | Multiple Isomorphous Replacement (X-ray crystallography) |
| MIR | Maximum Incremental Reactivity |
| MIR | Middle Irish |
| MIR | Maximum Information Rate (ATMF) |
| MIR | Microgravity Interdisciplinary Research |
| MIR | Men in Red |
| MIR | Medical International Research (Italy) |
| MIR | Most Important Requirement (systems engineering) |
| MIR | Master of Industrial Relations |
| MIR | Metro Investment Report |
| MIR | Malarkey Image Replacement |
| MIR | Micro-Instruction Register |
| MIR | Millimeter-Wave Imaging Radiometer |
| MIR | Mercer Island Reporter (Community Newspaper) |
| MIR | Maximum Individual Risk |
| MIR | Monument Information Resource |
| MIR | Microwave Imaging Radiometer |
| MIR | Media Information Repository |
| MIR | Medical Inspection Room |
| MIR | Monastir, Tunisia - Skanes (Airport Code) |
| MIR | Minimum Information Rate (frame relay circuits) |
| MIR | Mishap Investigation Report |
| MIR | McGill International Review |
| mIR | Multicast Interactive Radio |
| MIR | Maximum Impact Research |
| MIR | More Information Required |
| MIR | Molecular Impulse Response |
| MIR | Mygrid Information Repository |
| MIR | Matched-Information Rate |
| MIR | Mobile IMAP Reader |
| MIR | Mission Integration Review |
| MIR | Mom In Room (internet chat) |
| MIR | Master Inventory Record |
| MIR | Material Inspection Report |
| MIR | Military Infrastructure Requirement |
| MIR | Music Data Bases |
| MIR | Major Impact Report |
| MIR | Mission Impact Report |
| MIR | MNC Interoperability Requirement |
| MIR | Maximum Performance Achievable Increasing Resources |
| MIR | Modern Institute of Reflexology Inc |
| MIR | Machine Initiation Relay |
| MIR | Midday Intelligence Report (US CIA) |
| MIR | Master Index Report |
| MIR | Material Investigation Report (GTE Services) |
| MIR | Multiple Instructor Requirement |
| MIR | Missile Intercept Report |
| MIR | Mandatory Inspection Requirement |
| MIR | Maintenance Incident Report (Royal Australian Air Force) |
| MIR | Mobile Information Around Russia |
| MIR | Merchant Initiated Return |
| MIR | Major Item Repairman |
| MIR | Management in Radiology |
| MIR | Made in Romania |
| MIR | Machine Independent Restoration (O&O Software) |
| MIR | Market Intelligence Report |
| MIR | Manx International Rally (Isle of Man) |
| MIR | Milken Institute Review (various locations) |
| MIR | Mortgage Interest Rate (housing market) |
| MIR | Mallinckrodt Institute of Radiology (Washington University in St. Louis) |
| MIR | Market-Implied Ratings (Moody's) |
| MIR | Musical Instrument Repair |
| MIR | Management Information Report |
| MIR | Management Information Repository (Sprint) |