# M (disambiguation)

M, or m, is the thirteenth letter of the English alphabet.
M may also refer to:

## Companies and products

* M (fragrance), a 2008 fragrance by Mariah Carey
* M-series rangefinder, a series of Leica camera models
* M (virtual assistant), a former virtual assistant in Facebook Messenger
* Macy's, Inc. (NYSE: M), an American department store chain
* Mercedes-Benz M-Class
* Miracle Mart, a Canadian department store known simply as "M" from 1986 to 1992
* Android M, a code name for the Android Marshmallow operating system
* BMW M, a subsidiary of car manufacturer BMW
* Farmall M, a tractor produced by International Harvester from 1939 to 1952
* Infiniti M, a line of cars

## Numbers and units of measurement

* metre, symbol m
* mile (abbr.)
* nautical mile
* milli-, SI prefix m
* 1000 (number), Roman numeral M
* mega-, SI prefix M
* million (abbr.)
* minute, symbol m

## Postal codes

* M, the postal code letter for Toronto in Canada
* M postcode area, a group of several postcode districts in Greater Manchester

## Science and technology

* M (videocassette format), an obsolete recording format
* M-theory, a proposed solution for problems in superstring theories
* M band, radio frequencies from 60 to 100 GHz
* Mass (symbol m)
* Magnetic quantum number (symbol m)
* Messier object, in astronomy
* Metal (placeholder symbol M)
* Methionine, an alpha amino acid in biochemistry
* Molality (symbol m)
* Molar concentration, unit m
* Molar mass, (symbol M)
* ATC code M Musculo-skeletal system, a section of the Anatomical Therapeutic Chemical Classification System
* Seismic magnitude scales, various scales of magnitude using variations of M
* Slope, represented by variable m in a linear equation

## Computing

* M or Wolfram Language, the programming language underlying Mathematica
* ".m", a MATLAB or GNU Octave file
* ".m", a Mathematica package
* ".m", an implementation file in Objective-C
* M, the MUMPS programming language
* M-code or just M, MATLAB programming language

## Transportation

* Mu (rocket family), also known as M, a series of Japanese solid-fuelled carrier rockets
* Rapid transit, sometimes called "Metro" and shortened to an M.
* M, the prefix used for British motorways

### Specific rail lines identified by the symbol "M"

* M (New York City Subway service)
* M Ocean View, San Francisco, U.S.
* Tokyo Metro Marunouchi Line, Tokyo Metro
* Midōsuji Line, Osaka Metro
* Honshi–Bisan Line, West Japan Railway Company

## Entertainment
### Characters

* M (Marvel Comics), a character associated with the X-Men universe
* M (James Bond), the codename of the fictional head of MI6
* Minoru Kokubunji (M), a Chobits anime character

### Film and television

* M (1931 film), a German film directed by Fritz Lang
* M (1951 film), a remake of the previous, shifting the action from Berlin to Los Angeles
* M, a 2006 Japanese film directed by Ryūichi Hiroki
* M (2007 film), made in South Korea
* M (2018 Finnish film), a film directed by Anna Eriksson, loosely inspired by the last days of Marilyn Monroe
* M (2018 French film), a documentary film directed by Yolande Zauberman about child abuse in Bnei Brak
* M, an obsolete film rating in the American Motion Picture Association of America film rating system
* M, films recommended for mature audiences in the Australian Office of Film and Literature Classification
* M, the production code for the 1965 Doctor Who serial The Romans
* Manchete, a Brazilian television network from 1983 to 1999
* M. Son of the Century (miniseries), a 2024 television adaptation of M: Son of the Century

### Print publications

* M (comic strip), a Norwegian comic strip
* M (John Cage book), a 1973 book by avant garde composer John Cage
* M (Peter Robb book), a 1998 book by Peter Robb about the Italian painter Caravaggio
* M (magazine), a monthly teenage magazine published by Bauer Media Group
* M: Son of the Century, a 2018 historical novel by Antonio Scurati

### Video games

* M, short for Mature, a rating used by the Entertainment Software Rating Board to denote that a video game contains mature content

### Music
#### Performers

* M (band), a British techno-pop project of the artist Robin Scott
* Matthieu Chedid, French singer (stage name "-M-")
* Lee Min-woo, Korean singer (stage name "M")
* Mem Nahadr, American singer and performance artist (stage name "M")

#### Albums

* M (John Abercrombie Quartet album), 1981
* M (Myrkur album), 2015
* M (Big Bang single album), 2015

#### Songs

* "M" (song), a 2000 song by Ayumi Hamasaki
* "M", a song by Chantal Kreviazuk from her album Colour Moving and Still
* "M", a song by The Cure from their 1980 album Seventeen Seconds
* "M", a song by Princess Princess from the 1989 album Diamonds
* "M's" (song), a 2015 song by ASAP Rocky

## Other uses

* M Resort, a hotel-casino in Las Vegas, Nevada, U.S.
* M-Source, a hypothetical source document for the Gospel of Matthew
* Moderaterna, a Swedish political party
* Baby M, subject of a famous child custody battle
* m, the International Phonetic Alphabet symbol for a voiced bilabial nasal sound
* М, a letter of the Cyrillic alphabet
* M-ratio, a measure of the health of a player's chip stack in poker
* \m/, a common way of typing corna or devil's horns
* 'm, contraction of am, part of the English copular verb to be
* M, the symbol for the old German currency German gold mark
* m, the masculine grammatical gender
* m or M, the male gender
* M., the abbreviation for Monsieur
* M., the regnal year abbreviation for Mary I of England following her marriage to Philip II of Spain
* m., married
* m. or man., an abbreviation for the Azerbaijani manat (currency)
* m., short for measure (music), a segment of time corresponding to a specific number of beats
* 𝕸, the Masoretic Text, the authoritative Hebrew text of the Tanakh
* Mike, the military time zone code for UTC+12:00
* Honório de Freitas Guimarães (1902–1968), member of the Brazilian Communist Party