| M-USA | Mercy- USA for Aid and Development 
| Others |
| M-WTCA | Mid-West Tool Collectors Association
| Others |
| M-ZRO2 | Monoclinic ZIRCONIUM DIOXIDE
| Others |
| M. | A Major Interval
| Others |
| M. | A Minor Interval
| Others |
| m. | Mane In the morning
| Others |
| m. | maskulin
| Others |
| M. | misce - mix
| Others |
| m. | mit
| Others |
| M. Dent. | Master of Dentistry
| Others |
| m. E. | meines Erachtens
| Others |
| M. ISMI | Member of the International Security Management Institute
| Others |
| M. Stomat. | Master of Stomatology
| Others |
| M.A | Master of Arts
| Others |
| M.A.Ed. | Master of Arts in Education
| Others |
| M.Ac | Master of Acupuncture
| Others |
| M.Aero.E. | Master of Aeronautical Engineering
| Others |
| M.Arch | Master of Architecture
| Others |
| M.B.S. | Multi Brand Store
| Others |
| M.C. | Military Cross (British)
| Others |
| M.C.D. | Menuetto Da Capo
| Others |
| M.C.L. | Master of Comparative Law
| Others |
| M.Com | Master of Commerce
| Others |
| M.Div. | Master of Divinity
| Others |
| M.E | Master of Engineering
| Others |
| M.Ed | Master of Education
| Others |
| M.Ed. | Masters in Education
| Others |
| M.F.A. | Master of Fine Arts
| Others |
| M.H.A. | Master of Hospital Administration
| Others |
| M.I.MECH.E | Member of the Institution of Mechanical Engineers
| Others |
| M.I.O. | Medical Information Officer
| Others |
| M.J | Master of Journalism
| Others |
| M.Li.S. | Master of Library Science
| Others |
| M.M | Master of Music
| Others |
| M.Med. | Master of Medicine
| Others |
| M.mist | MISTURA A mixture
| Others |
| M.O. | modus operandi [Lat. equiv. method of operating]
| Others |
| M.O. | modus operandi [Lat. method of operation]
| Others |
| M.O.V.E. | Mindset Over Verbal Excuses
| Others |
| M.ORTH | Membership in Orthodontic
| Others |
| M.R.E. | Meals-Ready-to-Eat
| Others |
| M.S. Ed. | Masters of Science in Eudcation
| Others |
| M.S.M. | Master of Sacred Music
| Others |
| M.S.P.T. | Master of Science in Physical Therapy
| Others |
| M.Sc | Master of Science (M.S)
| Others |
| M.Sc.Ag | Master of Science in Agriculture
| Others |
| M.Tech | Master of Technology
| Others |
| M.V. | Motor Vessel
| Others |
| M/A | Mature Age
| Others |
| M/A | Mutual Aid
| Others |