| Word | Description |
| M.A. | Master's of Arts |
| M.S. | Master of Science |
| M2SC | Montana Mathematics and Science Coalition |
| MAA | Mathematics Association of America |
| MAACE | Montana Association of Adult and Community Education |
| MAAE | Montana Alliance for Arts Education |
| MAAS | Montana Alternative Assessment School |
| MABE | Montana Association of Bilingual Education |
| MABLE | Montana Adult Basic and Literacy Education |
| MAC | Montana Arts Council |
| MACIE | Montana Advisory Council on Indian Education |
| MACSS | Montana Association of County Superintendents of Schools |
| MACTE | Montana Association of Colleges of Teacher Education |
| MAEA | Montana Art Education Association |
| MAEFAIRS | Montana Automated Education Finance and Information Reporting System |
| MAEMSP | Montana Association of Elementary and Middle School Principals |
| MAFCS | Montana Association of Family and Consumer Science |
| MAFHA | Montana Association of Future Homemakers of America |
| MAGIE | Montana Agriculture Implement Exposition |
| MAGTE | Montana Association of Gifted and Talented Education |
| MAHPER | Montana Association for Health, Physical Education and Recreation |
| MAHPERD | Montana Association for Health, Physical Education, Recreation and Dance |
| MALT | Montana Association of Language Teachers |
| MAP | Montana Advocacy Program |
| MAPA | Montana Association of Presidential Awardees |
| MAPS | Media Arts in the Public Schools |
| MAPT | Montana Association for Pupil Transportation |
| MAR | Montana Administrative Register |
| MARS | Mathematics Assessment Resource Service |
| MARS (iAnalyze) | Montana Analysis and Reporting System (iAnalyze) |
| MASBO | Montana Association of School Business Officials |
| MASC | Montana Association of Student Councils |
| MASCD | Montana Association of Supervision and Curriculum Development |
| MASP | Montana Association of School Psychologists |
| MASS | Montana Association of School Superintendents |
| MASSP | Montana Association of Secondary School Principals |
| MAT | Metropolitan Achievement Test |
| MATE | Montana Agra-Trade Exposition (held in Billings in Feb.) |
| MATELA | Montana Association of Teachers of Language Arts |
| MATF | Montana Association of Teachers of French |
| MATFCS | Montana Association of Teachers of Family and Consumer Science |
| MATG | Montana Association of Teachers of German |
| MAVICA | Montana Association of the Vocational Industrial Clubs of America |
| MBCC | Montana Board of Crime Control |
| MBEA | Montana Business Education Association |
| MBI | Montana Behavioral Initiative |
| MCA | Montana Communities in Action |
| MCA (Legal) | Montana Code Annotated. The Montana statutes, i.e., Montana law. |
| MCA (Psyc) | Montana Counseling Association |
| MCASE | Montana Council of Administrators of Special Education |
| MCEC | Montana Council of Exceptional Children |
| MCEL | Montana Conference of Educational Leadership |
| MCP | Montana Community Partners |
| MCSSW | Montana Council of School Social Workers |
| MCTM | Montana Council of Teachers of Mathematics |
| MCTSS | Montana Council of Teachers for the Social Studies |
| MDC | Montana Developmental Center |
| MEA-MFT | Montana Education Association-Montana Federation of Teachers |
| MEEA | Montana Environmental Education Association |
| METNET | Montana's Educational Telecommunications Network |
| MFE | Made For Excellence (conducted in state by a National Staff) |
| MFEA | Montana Forensics Educators Association |
| MGA | Montana Geographic Alliance |
| MGGA | Montana Grain Growers Association |
| MHESAC | Montana Higher Education Student Assistance Corporation |
| MHSA | Montana High School Association |
| MIEA | Montana Indian Education Association |
| MISTA | Montana Improving Schools Through Accreditation |
| MITEA | Montana Industrial Technology Education Association |
| MLA | Montana Library Association |
| MMASS | Montana Mathematics and Science Society |
| MMSAC | Montana Motorcycle Safety Advisory Committee |
| MMSEP | Montana Motorcycle Safety Education Program |
| MNA | Montana Nurses Association |
| MNCESR | Montana North Central Educational Service Region |
| MNETC | Montana Nutrition Education and Training Coordinator |
| MontCAS | Montana Comprehensive Assessment System |
| MontSASE | Montana State Accountability System for Education |
| MPEA | Montana Public Employee Association |
| MPRRC | Mountain Plains Regional Resource Center |
| MPTA | Montana Parent Teacher Association |
| MPTF | Montana Parent Teacher Foundation |
| MQEC | Montana Quality Education Coalition |
| MREA | Montana Rural Education Association |
| MSAC | Montana Science Advisory Council |
| MSASE | Montana State Accountability System for Education |
| MSBA | Montana School Boards Association |
| MSBCA | Montana School Bus Contractors Association |
| MSBDA | Montana School Bus Drivers Association |
| MSCA | Montana School Counselors Association |
| MSCA-CD | Montana School to Civilian Authorities-Counterdrug Operations |
| MSDB | Montana School for the Deaf and Blind at Great Falls |
| MSEAC | Montana Special Education Advisory Council |
| MSELC | Montana Schools eLearning Consortium |
| MSERM | Montana Special Education Reference Manual (1994). The abbreviation contains state and federal statutes and regulations related to special education. |
| MSF | Motorcycle Safety Foundation |
| MSFA | Montana Science Fair Association |
| MSFSA | Montana School Food Service Association |
| MSG | Montana Stockgrowers Association |
| MSI | Montana Science Institute |
| MSLC | Montana State Library Commission |
| MSLHA | Montana Speech, Language & Hearing Association |
| MSO | Montana Special Olympics |
| MSP | Math and Science Partnership |
| MSRC | Montana State Reading Council |
| MSSA | Montana Small Schools Alliance |
| MSSF | Montana School Services Foundation |
| MST | Montana Spanish Teachers |
| MSTA | Montana Science Teachers Association |
| Mt. L&R | Montana Laws and Rules. Replaced by MSERM in 1994, this document contains older, outdated regulations and policy. |
| MTATA | Montana Athletic Trainers' Association |
| MTDA | Montana Digital Academy |
| MTEA | Montana Traffic Education Association |
| MTF | Montana Tobacco-Free Coalition |
| MTFSEI | Montana Tobacco Free School of Excellence Initiative |
| MTSBA | Montana School Board Association |
| MTY | Montana Teacher of the Year |
| MUS | Montana University System |
| MUST | Montana Unified School Trust |
| MVA | Montana Vocational Association |
| MVATA | Montana Vocational Agricultural Teachers Association |
| MVD | (Montana) Motor Vehicle Division (Department of Justice) |
| MWIEA | Montana Wyoming Indian Education Association |