M is the thirteenth letter of the modern Latin alphabet.
M may also refer to:
Companies and products
- M (fragrance), a 2008 fragrance by Mariah Carey
 - M-series rangefinder, a series of Leica cameras
 - 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 Israeli 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, a 2023 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, the Masoretic Text, the authoritative Hebrew text of the Tanakh
 - Mike, the military time zone code for UTC+12:00
 
See also
- M series (disambiguation)
 - M Train (disambiguation)
 - Mister M (disambiguation)
 - MU (disambiguation) (mu; Ancient Greek: Μ / Greek: μ)
 - MM (disambiguation)
 
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