MM or Mm or mm can mean or be an abbreviation for:

Military:

• Machinist's Mate, a rating in the United States Navy
• Military Medal, a British and Commonwealth decoration

Commerce:

• Market maker
• Million, in traditional accounting or investment banking
• Minute Maid, a brand of orange juice and other beverages
• MM cigarettes, a Bulgarian brand of cigarettes
• MM beer, a beer produced in the city of Varna, Bulgaria
• MM, the IATA code of EuroAtlantic Airways and SAM Colombia
• M&M's, a brand of chocolates
• Moderation Management
• Money Market, an area of investment banking and corporate finance
• Myrtle Madness, the largest American national Ford Probe and Mazda MX-6 owners' gathering, held every November in Myrtle Beach, South Carolina

Scientific, computing and engineering:

• Macromedia (MM)
• MailMangle mail filter
• Megametre (Mm)
• Millimetre (mm)
• Micro Mart (MM - Weekly computer magazine)
• Roman numeral for 2,000 (MM), including the year 2000
• MM Linux kernel patches made by Andrew Morton
• Modified Mercalli Intensity Scale
• Molecular mechanics
• Molecular modelling
• Multimedia Card (MM card)
• Momme, a measure of the weight of silk or pearls. See Japanese units of measurement
• Michelson-Morley experiment
• Mansfield-MacNichol transform

Medicine:

• Materia Medica, a homoeopathic guide organised alphabetically by remedy rather than by symptom
• Maximum Medicine
• Modern Medicine
• Multimedia Medicine
• Multiple Myeloma
• My Medicine

Arts and entertainment:

• Maelzel's metronome, which precedes a beats-per-minute tempo measurement
• Marilyn Monroe
• Mark Morford, SFGate.com columnist of eclectic, biting, incandescently funny satire
• MM (Bulgarian music channel), a Bulgarian music channel also known as Music Mania
• MM Minimano, a dance music producer that from Hong Kong
• Morning Musume
• Recording artists with the initials MM, such as Eminem (Marshall Mathers), Marilyn Manson (He usually signs himself as "MM"), Mandy Moore, Malice Mizer and Miranda Murphy
• Modern Marvels
• Muscle Museum - a single by the British band Muse.

Education:

• Mad Minute
• Master of Management

Schools:

• Montgomery Middle (Sweetwater Union High School District), (San Diego, California)

Gaming:

• Majora's Mask, a Nintendo 64 side story in The Legend of Zelda franchise
• Massively multiplayer
• Materia Magica, an online MUD
• Medieval Madness (pinball), a pinball machine
• Mega Man (video game)
• Might and Magic, a series of computer video games
• Moderna Misstag, a Swedish Quake II Clan
• Monster Manual, a Dungeons & Dragons core rulebook
• Mushmom, from the MMORPG MapleStory

Geography:

• Metro Manila
• Myanmar (MM)

Sports and Athletics:

• March Madness, a common name for the NCAA Men's Division I Basketball Championship

Miscellaneous:

• "Mei Mei" (妹妹), babe or hottie as used in Chinese internet parlance (literally means "little sister" or young girl)
• "Merry meet", the traditional greeting used in neopagan or Wiccan circles
• Mexican Mafia, an American prison gang
• Minister Mentor, special advisory title in the current Government given to Lee Kuan Yew, founder and former Prime Minister of Singapore
• Middle Marker, an identification point on an ILS approach

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