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 Sharp (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
- 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
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
See also
- M series (disambiguation)
- M Train (disambiguation)
- Mister M (disambiguation)
- MU (disambiguation) (mu; Ancient Greek: Μ / Greek: μ)
- MM (disambiguation)