M
- Lebo M (b. 1964) — The Lion King 1½, Long Night's Journey into Day
- Galt MacDermot
- Teo Macero (1925–2008) — Virus, A.k.a. Cassius Clay
- Madonna
- Jun Maeda
- K. V. Mahadevan
- Shankar Mahadevan
- Taj Mahal
- Vusi Mahlasela
- Anu Malik
- Kalyani Malik
- Dmitry Malikov
- Matty Malneck
- Albert Hay Malotte
- Riichiro Manabe
- Josh Mancell
- Mark Mancina
- Henry Mancini
- Johnny Mandel
- Christopher Mann
- Roger Joseph Manning, Jr.
- Franco Mannino
- Manohar
- Clint Mansell (b. 1963) — π, Requiem for a Dream, The Fountain, Moon, Black Swan,
- Keith Mansfield
- Marilyn Manson (b. 1969) — Resident Evil, Splatter Sisters
- Tigran Mansurian (b.1939) — The Color of Pomegranates, We and Our Mountains
- Kevin Manthei
- Homero Manzi
- Dario Marianelli (b. 1963) — Atonement, V for Vendetta, Agora
- Chris Marker (b. 1921) — Sans Soleil
- Richard Marriott
- Branford Marsalis
- Wynton Marsalis
- George Martin (b. 1926) — Yellow Submarine, Live and Let Die
- Jerry Martin
- Cliff Martinez (b.1954) — Sex, Lies, and Videotape, Solaris, Kafka
- J Mascis
- John Massari
- Massive Attack (formed 1988) — Danny the Dog, Bullet Boy, Battle in Seattle, Gomorrah
- Diego Masson
- Toshio Masuda
- Muir Mathieson
- Masaya Matsuura
- Dave Matthews
- Siegfried Matthus
- Billy May
- Brian May
- Simon May
- Curtis Mayfield (1942–1999) — Superfly
- Toshiro Mayuzumi
- Dennis McCarthy
- Paul McCartney
- Craig McConnell
- Bear McCreary
- Nathan McCree
- Keff McCulloch
- Gary McFarland
- Rory McFarlane
- Don McGlashan
- Bill McGuffie
- Tim McIntire
- Rod McKuen
- Joel McNeely
- Joe Meek
- DJ Mehdi
- Edmund Meisel (b. 1894-1930) — The Battleship Potemkin
- Gil Mellé (1931–2004) — The Andromeda Strain, My Sweet Charlie, Columbo
- Mike Melvoin
- Wendy Melvoin (b. 1964) — Heroes, Dangerous Minds
- Loy Mendonsa
- Alan Menken
- Dean Menta
- Johnny Mercer
- Freddie Mercury
- Wim Mertens
- Mateo Messina
- Dominic Messinger
- Metric
- Micki Meuser
- Mickey J Meyer
- Lanny Meyers
- Guy Michelmore
- Mario Migliardi
- Darius Milhaud
- Mladen Milicevic
- Marcus Miller
- Robyn Miller
- Chieli Minucci
- Paul Misraki
- Shyamal Mitra
- Shinkichi Mitsumune
- Hajime Mizoguchi
- Vic Mizzy
- Moby
- Cyril J. Mockridge
- Mogwai
- Ghulam Mohammed
- Madan Mohan
- S. Mohinder
- Charlie Mole
- Paddy Moloney
- Money Mark
- Francis Monkman
- Egil Monn-Iversen
- Hugo Montenegro
- Guy Moon
- Anthony Moore
- Dudley Moore
- Lennie Moore
- Mike Moran
- Mark Morgan
- Akihiko Mori
- Nobuhiko Morino
- Angela Morley (1924–2008) — Watership Down, The Slipper and the Rose, The Lady Is a Square
- Giorgio Moroder (b. 1940) — Midnight Express, Flashdance, American Gigolo, Scarface (1983 film), Impressionen unter Wasser
- Jerome Moross
- Andrea Morricone (b. 1964) — Cinema Paradiso, Capturing the Friedmans
- Ennio Morricone (b. 1928) — A Fistful of Dollars, For a Few Dollars More, The Good, the Bad and the Ugly, The Untouchables
- John Morris
- Trevor Morris
- Bob Mothersbaugh
- Mark Mothersbaugh (b. 1950) — The Royal Tenenbaums, The Life Aquatic with Steve Zissou, Rugrats, Crash Bandicoot
- Rob Mounsey
- Leszek Możdżer (b. 1971) — Nienasycenie, 1 000 000 $, Discover Chopin
- Dominic Muldowney (b. 1952) — Nineteen Eighty-Four, Sharpe, Copenhagen
- Mugison (b.1976)) — A Little Trip to Heaven
- Nico Muhly (b. 1981) — The Reader, Margaret
- Manas Mukherjee
- Hemanta Kumar Mukhopadhyay
- Pankaj Mullick
- David Munrow
- Vano Muradeli
- Rika Muranaka — Metal Gear Solid, Metal Gear Solid 2: Sons of Liberty, Metal Gear Solid 3: Snake Eater
- John Murphy (b. 1965) — 28 Days Later, Lock, Stock and Two Smoking Barrels, Sunshine, Kick-Ass
- Stanley Myers (1930–1993) — The Deer Hunter, The Voyager, The Witches
Read more about this topic: List Of Film Score Composers