- MGM Grand Hotel Fire, 1980
- Microcomputers
- Microforms
- Microwaves
- Midi Pumpers
- Midwest Floods, 1993
- Migration
- MIHCP
- Military Aircraft
- Military Antishock Trousers
- Military Assistance
- Military Defense
- Military Equipment
- Military Facilities
- Military Maneuvers
- Military Operations Other Than War
- Military Personnel
- Military Training
- Militias
- Mines
- Mini Pumpers
- Minicomputers
- Minneapolis Bridge Collapse
- Minorities
- MIS
- Miscarriages
- Missiles
- Missing Persons
- Mission Statements
- Mistakes
- Mitigation
- Mobile Command Vehicles
- Mobile Data Terminals
- Mobile Emergency Response Support
- Mobile Homes
- Mobile Integrated Healthcare Community Paramedicine
- Mobile Units
- Mobilization
- Models
- Modular Homes
- Moisture
- Monitors
- Monsoons
- Monte Carlo Methods
- Monuments
- Moon
- MOOTW
- Morale
- Morbidity
- Morgues
- Mortality
- Mortgages
- Mortuaries
- Motels
- Motion Sickness
- Motivation
- Motives
- Motor Homes
- Motor Vehicle Accidents
- Motorcycles
- Motors
- Moulage
- Mount Saint Helens Eruption, 1980
- Mountains
- Movie Theaters
- Movies
- MRSA
- MSDS
- Mt St Helens Volcano (1980)
- Multi Agency Coordination System
- Multi Year Development Plans
- Municipal Budgets
- Municipal Employees
- Municipal Fire Protection
- Municipal Government
- Murder
- Museums
- Musters
- Mutations
- Mutual Aid
- MVA
- MYDP
- Myocardial Infarction
- Myths