| M&L Records | Sweden | January 1, 2002 | — | 13 |
| M-Theory Audio | United States | January 1, 2017 | — | 1 |
| M2 | Russia | January 1, 2008 | — | 1 |
| Machete Empire Records | Italy | January 1, 2012 | — | 1 |
| Machete Music | United States | January 1, 2005 | — | 2 |
| Maciste Dischi | Italy | October 8, 2014 | — | 2 |
| Mack Avenue Records | United States | January 1, 1999 | — | 4 |
| Mad Decent | — | 2005 | Original Production | — |
| Mad Decent | United States | January 1, 2006 | — | 2 |
| Madacy Records | Canada | — | Imprint | — |
| Magenta | Argentina | January 1, 1967 | — | 1 |
| Magic Records | Poland | January 1, 1994 | — | 1 |
| Magic Stone | Taiwan | January 1, 1995 | — | 5 |
| Magna Carta Records | United States | January 1, 1989 | — | 1 |
| Magnatune | United States | April 2003 | Original Production | — |
| Magneoton | Hungary | January 1, 1990 | — | 3 |
| Mahakala Music | United States | January 1, 2018 | — | 1 |
| Major Label | Germany | January 1, 1998 | — | — |
| Major League Productions | United Kingdom | January 1, 1995 | — | — |
| Major9 | South Korea | January 1, 2017 | — | — |
| Maker Studios | United States | January 1, 2009 | — | — |
| Malaco Records | United States | January 1, 1962 | — | 1 |
| MAM | United Kingdom | January 1, 1970 | — | 2 |
| Mamamusic | Ukraine | January 1, 1999 | — | 6 |
| Mammoth Records | United States | January 1, 1989 | — | 2 |
| ManguJyoti Studioz | India | September 10, 2024 | — | — |
| Manhattan | United States | 1984 | Imprint | — |
| Manhattan Records | United States | January 1, 1984 | — | 1 |
| Mannequin | Italy | July 2008 | Original Production | — |
| Manticore Records | United Kingdom | January 1, 1973 | — | 4 |
| Map the Soul Inc. | South Korea | February 1, 2009 | — | — |
| Marathon Artists | United Kingdom | January 1, 2012 | — | 1 |
| Mariann | Sweden | 1972 | Imprint | — |
| Mariann | Sweden | January 1, 1972 | — | 133 |
| Maroo Entertainment | Japan | January 1, 2007 | — | 1 |
| Marshall Records | United Kingdom | January 1, 2016 | — | 2 |
| Marvel Music, Inc. | United States | September 9, 2005 | — | — |
| Marvelous | Japan | January 1, 2003 | — | — |
| MARVELOUS! | Japan | July 1, 2014 | Imprint | — |
| Mascot Records | Netherlands | January 1, 1989 | — | 2 |
| Maskulin | Germany | January 1, 2011 | — | 1 |
| Mass Appeal Records | United States | January 1, 2014 | — | 2 |
| Massacre Records | — | 1991 | Original Production | — |
| Massacre Records | Germany | January 1, 1991 | — | 7 |
| Massproduktion | Sweden | January 1, 1979 | — | 2 |
| Mastered Trax | Mexico | January 1, 2007 | — | 1 |
| Masters of Hardcore | Netherlands | July 1995 | Original Production | — |
| Masters of Hardcore | Netherlands | January 1, 1995 | — | 1 |
| MASTERSIX FOUNDATION | Japan | 2002 | Imprint | — |
| Masterworks | United States | 2010 | Imprint | — |
| Matador | United States | 1989 | Original Production | — |
| Matador Records | United States | January 1, 1989 | — | 12 |
| Materiali Sonori | Italy | February 15, 1979 | — | — |
| Mau5trap | Canada | July 23, 2007 | Original Production | — |
| Mau5trap | Canada | January 1, 2007 | — | 1 |
| Mausoleum Records | Belgium | January 1, 1982 | — | 3 |
| Maverick | United States | 1992 | Production | — |
| Maverick | United States | January 1, 1992 | — | 2 |
| Mavin Records | Nigeria | January 1, 2012 | — | 2 |
| MBK Entertainment | South Korea | January 1, 2006 | — | — |
| MCA Nashville | United States | 1973 | Imprint | — |
| MCA Records | United States | 1967 | Imprint | — |
| MCA Records | United States | January 1, 1962 | — | 15 |
| MCP Sound & Media | — | — | Production | — |
| MDM Recordings Inc. | Canada | January 1, 2008 | — | 1 |
| MEDIA FACTORY | Japan | April 1, 1991 | Imprint | — |
| Medley Records | Denmark | January 1, 1978 | — | 16 |
| Megaforce Records | United States | January 1, 1982 | — | 2 |
| Mello Music Group | United States | January 1, 2007 | — | 2 |
| Melodiya | Russia | May 11, 1964 | — | — |
| Membran International | Germany | January 1, 1969 | — | — |
| Memphis Industries | United Kingdom | 1998 | Original Production | — |
| Memphis Industries | United Kingdom | January 1, 1998 | — | 1 |
| Menart Records | Slovenia | January 1, 1994 | — | — |
| MER Musikk | Norway | January 1, 2013 | — | — |
| Mercury Records | United States | 1945 | Imprint | — |
| Mercury Records | United States | January 1, 1945 | — | 65 |
| Mere Records | Norway | December 20, 2006 | — | — |
| Merge Records | — | 1989 | Original Production | — |
| Merge Records | United States | January 1, 1989 | — | 7 |
| Mescal | Italy | January 1, 1993 | — | 1 |
| Metal Blade Records | United States | 1981 | Imprint | — |
| Metal Blade Records | United States | January 1, 1982 | — | 12 |
| METAL FRONTIER | Japan | — | Reissue Production | — |
| Metal Hammer | Germany | 1983 | — | — |
| Metal Mind Productions | — | 1987 | Production | — |
| Metal Mind Productions | Poland | January 1, 1987 | — | — |
| Metalgate | Czech Republic | September 25, 2012 | — | — |
| Metalheadz | United Kingdom | 1994 | Original Production | — |
| Metronome | Sweden | 1949 | Imprint | — |
| Metronome | Sweden | January 1, 1949 | — | 55 |
| Metropolis Records | — | 1993 | Original Production | — |
| Metropolis Records | United States | January 1, 1995 | — | 5 |
| Mexican Summer | United States | January 1, 2008 | — | 2 |
| MGM Records | United States | January 1, 1946 | — | 7 |
| Microphone Records | Latvia | January 1, 1996 | — | — |
| Microqlima | France | September 1, 2014 | Production | — |
| Mighty Music | Denmark | January 1, 1997 | — | 1 |
| Mike Roft | Czech Republic | January 1, 2015 | — | — |
| Milan | United States | 1978 | Imprint | — |
| Milan | United States | January 1, 1978 | — | 4 |
| Milestone | United States | 1966 | Original Production | — |
| Milieu Music Digital | United States | 2009 | Original Production | — |
| Mill Records | Sweden | January 1, 1982 | — | 2 |
| Million Market | South Korea | August 25, 2015 | — | — |
| Ministry of Sound | United Kingdom | 1993 | — | — |
| Minos EMI | Greece | January 1, 1931 | — | 2 |
| Mirage Records | United States | January 1, 1980 | — | 1 |
| MK Music | Brazil | August 13, 1986 | — | 25 |
| MLD Entertainment | South Korea | January 1, 2012 | — | — |
| MMV | Japan | June 25, 1997 | Imprint | — |
| MNH Entertainment | South Korea | November 18, 2014 | — | 1 |
| MNRK Music Group | United States | January 1, 1999 | — | 5 |
| MNW Music | Sweden | January 1, 1969 | — | 67 |
| Mo' Wax | United Kingdom | January 1, 1992 | — | — |
| Mobile Fidelity Sound Lab | United States | 1977 | Reissue Production | — |
| Modern Records | United States | January 1, 1980 | — | 1 |
| Modular Recordings | Australia | 1998 | Original Production | — |
| Modular Recordings | Australia | January 1, 1998 | — | 1 |
| Mojo Records | United States | January 1, 1995 | — | 1 |
| Mom + Pop Music | United States | January 1, 2008 | — | 4 |
| Mom+Pop | — | 2008 | Original Production | — |
| MONADD | Mongolia | January 1, 2019 | — | — |
| Monkeywrench Records | United States | January 1, 2009 | — | 1 |
| Mono Music | Sweden | January 1, 1987 | — | 4 |
| Monolith Records | Russia | January 1, 1994 | — | 1 |
| Monsp Records | Finland | January 1, 1997 | — | 1 |
| Monstercat | — | July 1, 2011 | Original Production | — |
| Monstercat | Canada | January 1, 2011 | — | 1 |
| Monstre Marin Corporation | France | January 1, 2013 | — | — |
| Monument | United States | 1958 | Imprint | — |
| MOON RECORDS | Japan | 1982 | Imprint | — |
| Moon Records | Japan | January 1, 1982 | — | — |
| Moon Records Ukraine | Ukraine | January 1, 1997 | — | 1 |
| Moradisc | France | November 19, 1980 | — | — |
| Moserobie | Sweden | January 1, 2000 | — | 3 |
| Moshi Moshi Records | United Kingdom | 1998 | Original Production | — |
| Moshi Moshi Records | United Kingdom | January 1, 1998 | — | 1 |
| Mosquito Records London Pty Ltd. | South Africa | January 1, 2002 | — | 19 |
| Most Wanted Music | France | January 1, 2010 | — | — |
| Mother West | United States | January 1, 1990 | — | 1 |
| Motor Music | — | 1994 | Original Production | — |
| Motown | United States | September 1959 | Original Production | — |
| Motown | United States | January 12, 1959 | — | 8 |
| Motéma Music | United States | January 1, 2003 | — | 2 |
| Mountain | United Kingdom | January 1, 1975 | — | 1 |
| Moviechi | Iran | May 1, 2021 | — | — |
| Movieplay | Spain | January 1, 1968 | — | 5 |
| Moving Shadow | United Kingdom | 1991 | Original Production | — |
| MPL Communications | United Kingdom | January 1, 1970 | — | — |
| MPS | — | 1968 | Production | — |
| MPS Records | Germany | January 1, 1968 | — | 1 |
| Mr Bongo | United Kingdom | 1989 | Original Production | — |
| Mukmin Pro Sdn. Bhd. | Malaysia | January 1, 2022 | — | — |
| Multisonic | Czech Republic | February 27, 1990 | — | 1 |
| MUN HWA IN | South Korea | May 18, 2016 | — | — |
| Musart | Mexico | January 1, 1948 | — | 1 |
| Musea | France | November 1985 | Production | — |
| Mushroom Records | Australia | 1972 | Production | — |
| Mushroom Records | Australia | January 1, 1972 | — | 4 |
| Mushroom Records | Canada | January 1, 1974 | — | 1 |
| Music Brokers | — | 1997 | Reissue Production | — |
| Music Brokers | Argentina | January 1, 1997 | — | 1 |
| Music Club | — | 1991 | — | — |
| Music Digital | Germany | — | Imprint | — |
| Music Factory | — | 1985 | Reissue Production | — |
| Music Farm | South Korea | January 1, 2001 | — | — |
| Music for Nations | United Kingdom | 1983 | Original Production | — |
| Music for Pleasure | — | 1965 | Imprint | — |
| Music House | United States | 2003 | Original Production | — |
| Music K Entertainment | South Korea | January 1, 2012 | — | — |
| Music Ray'n | Japan | April 1, 2005 | — | 1 |
| Music Super Circus | Sweden | June 21, 2007 | — | — |
| Music World Entertainment | United States | January 1, 1992 | — | 1 |
| Musica Studios | — | October 1971 | Production | — |
| Musical Freedom | — | August 2009 | Imprint | — |
| Musical Heritage Society | United States | 1962 | Imprint | — |
| MusicRay’n | Japan | April 2005 | Imprint | — |
| Musidisc | Brazil | January 1, 1952 | — | 2 |
| Musidisc | United States | January 1, 1927 | — | 1 |
| Musikkoperatørene | Norway | January 1, 1995 | — | — |
| Musikproduktion Dabringhaus und Grimm | — | 1978 | Original Production | — |
| Musikverkstan | Sweden | January 1, 1997 | — | 5 |
| Musique Nomade | Canada | January 1, 2006 | — | 1 |
| Mute | United Kingdom | 1978 | Imprint | — |
| Mute Records | United Kingdom | January 1, 1978 | — | 11 |
| Mutombo Records | — | 2020 | Original Production | — |
| MVG Records | Sweden | January 1, 1991 | — | 5 |
| My Proud Mountain | Germany | January 1, 2011 | — | — |
| MyMajorCompany | France | June 8, 2007 | — | — |
| Myrrh Records | United States | January 1, 1972 | — | 3 |
| Mystic Production | Poland | November 20, 1995 | — | 3 |
| Mystic Records | United States | January 1, 1980 | — | 1 |
| Mystic Story | South Korea | January 1, 2001 | — | — |
| MZA Music | Brazil | January 1, 1996 | — | 1 |
| Mökkitie Records | Finland | January 1, 2012 | — | — |