| M&I | Maintenance & Improvement 
| Others |
| M/I | Minimum Impulse
| Others |
| MI | 1001 (Roman numeral)
| Others |
| MI | MacDonald Inspection
| Others |
| MI | Machine Independent
| Others |
| MI | Machine Interface
| Others |
| MI | MacKay Icosahedron
| Others |
| MI | Macmet, India
| Others |
| MI | Made In
| Others |
| MI | Main Idea
| Others |
| MI | Mainframe Interface
| Others |
| MI | Maison Ikkoku
| Others |
| MI | Major Issue
| Others |
| MI | Malice Intended
| Others |
| MI | Malicious Intent
| Others |
| MI | Malleable Iron
| Others |
| MI | Management Information
| Others |
| MI | Management Instruction
| Others |
| MI | Manager Institut
| Others |
| MI | Manga International
| Others |
| MI | Manual Input
| Others |
| mi | Maori
| Others |
| MI | Marching Illini
| Others |
| MI | Marginal Inscription
| Others |
| MI | Market Imitating
| Others |
| MI | Market Initiative
| Others |
| MI | Market Intelligence
| Others |
| MI | Market Investigation
| Others |
| MI | Marketing Institute
| Others |
| MI | Markside Inside
| Others |
| MI | Marshall & Ilsley
| Others |
| MI | Maskable Interrupt
| Others |
| MI | Masked Intruder
| Others |
| MI | Master Index
| Others |
| MI | Master Iridologist
| Others |
| MI | Master Item
| Others |
| MI | Matched Items
| Others |
| MI | Material Identifier
| Others |
| MI | Material Input
| Others |
| MI | math In
| Others |
| MI | Mathematical Induction
| Others |
| MI | Mature Industry
| Others |
| MI | Maximum Impact
| Others |
| MI | Maximum Index
| Others |
| MI | Maximum Influence
| Others |
| MI | McAuley Institute
| Others |
| MI | Mean In
| Others |
| MI | Measurement Incorporated
| Others |
| MI | Measurement Interval
| Others |
| Mi | mebi
| Others |
| Mi | Mebi- (2^20)
| Others |
| MI | Mechanical Index
| Others |
| MI | Mechanical Interlock
| Others |
| MI | Medical Informatics
| Others |
| MI | Medical Innovation
| Others |
| MI | Medical Insurance
| Others |
| MI | Medicare and insurance
| Others |
| MI | Melt Flow Index (Melt Index)
| Others |
| MI | Member Institutions
| Others |
| MI | Members Interests
| Others |
| MI | Membership Involvement
| Others |
| MI | Memory Information
| Others |
| MI | Mental Idiot
| Others |
| MI | Mental Illness
| Others |
| MI | Mentally Impaired
| Others |
| MI | Mentally Insane
| Others |
| MI | Menu Image
| Others |
| MI | Menu Item
| Others |
| MI | Message Invader
| Others |
| MI | Methodical Images
| Others |
| MI | Methylisothiazolinone
| Others |
| MI | MI is
| Others |
| MI | Michalovce
| Others |
| MI | Michigan
| State |
| MI | Michigan Indoors
| Others |
| MI | Michigan International
| Others |
| MI | Micro Instruction
| Others |
| MI | Micronutrient Initiative
| Others |
| MI | Middle Initial
| Others |
| MI | Midnight Insanity
| Others |
| MI | Midway Island
| Others |
| MI | Midwest Industries
| Others |
| MI | Milan, Italy
| Others |
| MI | Milano (Provence)
| Others |
| MI | Mild Impairment
| Others |
| mi | Mile
| Others |
| Mi | mile(s)
| Others |
| MI | Miles
| Others |
| MI | Military Industry
| Others |
| MI | Military Intelligence
| Others |
| MI | Militia Immaculatae
| Others |
| MI | Millennia Instituite
| Others |
| MI | Millennia Institute
| Others |
| MI | Millipore
| Others |
| MI | Mineral Insulated
| Others |
| MI | Mineral-Insulated
| Others |
| MI | Minimal Intervention
| Others |
| MI | Ministerio del Interior
| Others |
| MI | Ministry of Intelligence
| Others |
| MI | Minor Irrigation
| Others |
| MI | Minority Institutions
| Others |
| MI | Minority Interest
| Others |
| MI | Miscellaneous
| Others |
| MI | Missing Ice
| Others |
| MI | Missing Information
| Others |
| MI | Missing Intern
| Others |
| MI | Mission Impossible
| Others |
| MI | Mission: Impossible
| Others |
| MI | Missouri-Illinois Railroad (Union Pacific Railroad)
| Others |
| MI | Mitab is
| Others |
| MI | Mitral Insufficiency
| Others |
| MI | MIttwoch
| Others |
| MI | Mobile Infantry
| Others |
| MI | Mobile Internet
| Others |
| MI | Mode Indicator
| Others |
| MI | Model Independent
| Others |
| MI | Modification Index
| Others |
| MI | Modified Inertia
| Others |
| MI | Molecular Interactions
| Others |
| MI | Monkey Island
| Others |
| MI | Monkey Islandand
| Others |
| MI | Monsters, Inc.
| Others |
| MI | Monumental Inscription
| Others |
| MI | Monza Indianapolis
| Others |
| MI | Mood Indigo
| Others |
| MI | MOPS International
| Others |
| MI | Mortgage Insurance
| Others |
| MI | Most Improved
| Others |
| MI | Motivational Interviewing
| Others |
| MI | Mounted Infantry
| Others |
| MI | Move In
| Others |
| MI | Movement Instructions
| Others |
| MI | Moving Image
| Others |
| MI | Mr. Incredible (Jude Abaga)
| Others |
| MI | Multi Interface
| Others |
| MI | Multimedia Integrated
| Others |
| MI | Multiple Imputation
| Others |
| MI | Multiple Inheritance
| Others |
| MI | Multiple Intelligences
| Others |
| MI | Multiple Inverse
| Others |
| MI | Mumbai Indians
| Others |
| MI | Murderball, Inc.
| Others |
| MI | Muscle Intelligence
| Others |
| MI | Music Industry
| Others |
| MI | Musicians Institute
| Others |
| MI | Mustang Island
| Others |
| MI | Mustered In
| Others |
| MI | Mutual Information
| Others |
| MI | myocardial infarct(ion)
| Others |
| MI | Myocardial Infarction
| Others |
| MI | Phthiotis
| Others |
| MI | Province of Milan
| Others |
| Mi | Sammi Cheng
| Others |
| MI | SilkAir
| Others |
| Mi | Xiaomi
| Others |