# MM

MM or variants may refer to:

## Alphabets

* Meitei Mayek or Meetei Mayek, the writing system of Meitei language

## Arts, entertainment, and media
### Music

* MM (album), 1989, by Marisa Monte
* Maelzel's metronome, a music marking
* Marilyn Manson, an American musician
* Marshall Mathers, an American rapper (a.k.a. "Eminem")
* Mother Mother, a Canadian band
* Master of Music, an academic degree
* Melody Maker British music publication
* "MM", a 1993 song by Mr. President
* Major Moment, an American rock music band from Boston, Massachusetts

### Television

* MM (TV channel), Bulgaria
* MM, the production code for the 1967 Doctor Who serial The Tomb of the Cybermen

### Other media

* MM!, a Japanese light novel, manga and anime series by Akinari Matsuno
* Media Molecule, a video game developer in England
* Monster Manual, a 1977 Dungeons & Dragons source book
* Mother's Milk (character), aka "MM", a fictional character in The Boys comicbook franchise

## Businesses, organizations, and teams

* Middle-market company or mid-market companies have annual revenues of $50 million to $1 billion or between 100 and 1000 employees
* Maryknoll, a Catholic religious institute
* Maybach-Motorenbau GmbH and Maybach-Manufaktur and Mercedes-Maybach; an engine and car marque
* Moderation Management, alcohol support group
* Mumbai Magicians, a defunct Hockey India League franchise
* Peach (airline) (IATA code: MM)
* SAM Colombia (former IATA code: MM)
* MM, logo of the Leipzig Trade Fair abbreviation for Mustermesse (English: Sample fair)

## Degrees, honorifics, and titles

* Machinist's Mate in the US Navy
* Master mariner
* Master of Management, a degree
* Master of Medicine, a degree
* Master of Music, a degree
* Military Medal, British and Commonwealth
* Minister Mentor, a Singapore cabinet position
* messieurs, a plural honorific in French

## Latinisms

* 2000 (number) in Roman numerals
* The year 2000 in Roman numerals
* Mutatis mutandis ("m.m."), "with things changed that should be changed"

## Transportation

* MM (New York City Subway service), a former New York City Subway service

## Places

* Metro Manila, the Philippines' national capital region
** Mega Manila, its larger metropolis
* Myanmar (ISO 3166-1 country code: MM)

## Science, technology, and mathematics
### Computing

* .mm, Internet country code top-level domain for Myanmar
* ".mm", the file extension for FreeMind and Freeplane data files
* ".mm", the file extension for source code files of Objective-C++
* mm tree, the Andrew Morton's Linux kernel tree
* MM algorithm, an iterative method for constructing optimization algorithms
* Columbia MM, an early e-mail client
* Multiple master fonts
* Mattermost, an online chat service

### Units of measurement

* Megametre (Mm) (rare) 1,000 km
* Mile Marker (MM)
* Millimetre (mm)
* Millimolar (mM), a unit of concentration of a solution
* Momme, a unit of textile measurement
* One million (MM), used in reference to currency
* Percent concentration by mass (m/m%, %m/m, or m%), a unit of relative mass concentration

### Other uses in science, technology, and mathematics

* Minimax or maximin, a decision rule
* Modified Mercalli scale for earthquake intensity
* Molecular mechanics, computational chemistry technique
* Moving magnet, phonograph cartridge type
* Moving mean in statistics
* Multiple myeloma, blood cancer
* Mischmetal, alloy of similar lanthanoids