- Megaphone
- Megapixel
- Megastar
- Megatrend
- Meh
- Melancholy
- Melee
- Meliorate
- Melioration
- Melodramatically
- Melody
- Meltdown
- Melted and melted
- Members
- Memecylon
- Memorandum
- Memorandum of association
- Memorandum of understanding
- Memorial
- Memorial day
- Memorisation
- Memory location
- Memory resident
- Menage
- Mend ones manners or ways
- Mend ones ways
- Mendicancy
- Meninx
- Menopause
- Menshevic
- Menstrous
- Menstrual
- Mensuration
- Menswear
- Mental capacity
- Mental control
- Mental worry
- Mentally
- Mephistophelian
- Mercenary
- Merchandiser
- Merchant bank
- Merchants
- Merciful
- Mercurial
- Mercury is rising
- Mere
- Merengue
- Merger
- Meritorious
- Mermaid
- Merrymaking
- Mesentery
- Mesmerism
- Mesonic
- Mesquite
- Messed up
- Messenger of peace
- Messianic jew
- Messrs
- Metabasis
- Metabolism
- Metabolize
- Metal fatigue
- Metal leaf
- Metal zinc
- Metallic voice
- Metallize
- Metallography
- Metamorphosis
- Metaphor
- Metastasize
- Mete
- Meteorologist
- Meter
- Methamphetamine
- Methane
- Method of inhailing
- Meticulousness
- Metropolis
- Mew
- Mews
- Miaul
- Mickey
- Micr
- Microbiome
- Microcephal
- Microscopically
- Microvilli
- Mid section
- Mid-band
- Mid-ocean
- Mid-range
- Midas touch
- Middle world
- Middle-aged
- Midge
- Midland
- Midstream
- Midweek