MM
- mm – (s) Millimetre
- Mm – (s) Megametre
- MM – (i) Military Medal – (s) Myanmar (ISO 3166 digram) – Two Thousand (in Roman numerals)
- MMA – (i) Mixed martial arts – Moving Mechanical Assembly
- MMC – (p) Machinist's Mate, Chief (USN rating) – (i) Materiel Management Centre
- MMCM – (p) Machinist's Mate, Master Chief (USN rating) – (i) Magnetic Mine Counter Measure
- MMCS – (p) Machinist's Mate, Senior Chief (USN rating)
- MMEV – (i) Multi-Mission Effects Vehicle
- MMI – (i) Man-Machine Interface
- MMI – (i) Magical MonkeyZ Inc.
- MMK – (s) Burmese kyat (ISO 4217 currency code)
- MMO – (i) Massively Multiplayer Online (computer game)
- MMOR – (i) Master of Management in Operations Research
- MMORPG – (i) Massively multiplayer online role-playing game
- MMPR – Mighty Morphin Power Rangers
- MMR – (i) Measles, Mumps and Rubella vaccine – (s) Myanmar (ISO 3166 trigram)
- MMS – (i) Multimission Modular Spacecraft
- MMU – (i) Manchester Metropolitan University – (i) Manned Manoeuvring Unit
- MMW – (p) Millimetre Wave (radar, from "mm Wave")
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