Glossary of maritime terminology
- M/E Control System
- Magnetic Compass
- Maiden Voyage
- Main Air Compressor
- Main Clock
- Main Deck
- Main Engine
- Main Engine Control System
- Main Propulsion Boiler
- Main Switch Board
- Main Switchboard
- Manifest
- Manning Agency
- Marine Aids to Navigation
- Marine Diesel Generator
- Marine Evacuation System
- Marine Growth Prevention System
- Marine Navigation Light
- Marine Power Management System
- Marine Propeller Shaft
- Marine Provisions Crane
- Marine Regulation Authority
- Marine Selective Catalytic Reduction System
- Marine Sewage Plant
- Marine Signal Light
- Marine Surveyor
- Marine Surveyor
- Marine Toilet
- Marine VHF Radio
- Marine Wastewater Treatment
- Maritime
- Maritime Academy
- Maritime English
- Maritime Lecturer
- Maritime Medical Certificate
- Maritime Recruitment
- Maritime Recruitment Fair
- Maritime Recruitment Officer
- Maritime Training Center
- MARPOL
- Master
- Master Clock
- Masthead Light
- Medical Center
- Merchant Marines
- Merchant Navy
- MES
- Messman
- MGPS
- Middle Watch
- Mike
- Minimum Safe Manning
- Mining Vessel
- MKC Online Catalogue
- MMSI
- Mobile Offshore Drilling Unit
- Moor
- Mooring Line
- Mooring Winch
- Morning Watch
- Morse Lamp
- Motor Ship
- Motor Vessel
- Motorman
- MSB
- Multipurpose Ship
- Muster Drill