| Moskovskij teatr imeni Leninskogo komsomola | Moskovskij teatr imeni Leninskogo komsomola | Russia, Moscow, ул. М.Дмитровка, 6 | 1939-04-20 | -- | 1939–2011 | 2 | |
| Maddermarket Theatre | Maddermarket Theatre | England, Norwich, Norfolk, St Johns Alley | 1925-10-26 | 2002-02-02 | 1925–2002 | 21 | |
| Moskovskij Chudožestvennyj akademičeskij teatr | Moskovskij Chudožestvennyj akademičeskij teatr | Russia, Moscow, Kamergerskiy Pereulok 3 | 1899-02-19 | -- | 1899–1960 | 8 | |
| Museo do Oriente | Museu do Oriente (Museum of the Orient) | Portugal, Lisbon, Doca de Alcantara Norte, Av. Brasília, 1350-352 | 2020-12-28 | 2020-12-30 | 2020 | 1 | |
| Mátészalka | Mátészalka | Hungary, Mátészalka | 1925-07-16 | -- | 1925–1941 | 2 | |
| Main, The | The Main | United States, Santa Clarita, 24266 Main Street | 2018-06-22 | 2018-06-24 | 2018 | 1 | |
| Mercury Theatre Colchester | Mercury Theatre Colchester | England, Colchester, Essex, Balkerne Gate | 2009-11-05 | 2009-11-21 | 2009 | 1 | |
| Markgrafentheater | Markgrafentheater | Germany, Erlangen, Theaterpl. 2 | 2000-03-09 | 2010-06-13 | 2000–2010 | 4 | |
| Maverick Theatre | Maverick Theatre | United States, Woodstock, 120 Maverick Rd | 1934-08-09 | 1937-07-25 | 1934–1937 | 2 | |
| Mellomhagen ungdomsskole | Mellomhagen ungdomsskole | Norway, Larvik, Mellomhagen 31 | 2007-02-07 | -- | 2007 | 1 | |
| Margaretaparken | Margaretaparken | Sweden, Stockholm, Gamla Enskede | 2003-08-30 | 2003-09-19 | 2003 | 1 | |
| Massachusetts Institute of Technology (MIT) | Massachusetts Institute of Technology (MIT) | United States, Cambridge, 77 Massachusetts Ave | 1964-01-24 | -- | 1964 | 1 | |
| Marxzell | Marxzell | Germany, Marxzell | -- | -- | | | |
| Medway Little Theatre | Medway Little Theatre | England, Rochester, 256 High Street | 2016-05-10 | 2016-05-21 | 2016 | 1 | |
| Mosjøen | Mosjøen | Norway, Mosjøen | 1966-05-08 | -- | 1966–2005 | 6 | |
| Maltings | Maltings | England, Berwick-upon-Tweed, Eastern Ln | 2011-06-16 | -- | 2011 | 1 | |
| Morosco Theatre | Morosco Theatre | United States, New York, 217 West 45th Street | 1937-12-27 | 1938-04-30 | 1937 | 1 | |
| Manchester Library | Manchester Library | United States, Manchester, 8067 E Main St | 2006-11-04 | -- | 2006 | 1 | |
| MXAT | MXAT | Russia, Moscow, Камергерский пер., 3 | 1905-03-31 | 2001-05-03 | 1905–1999 | 5 | |
| Mandal, Kinoen | Kinoen Mandal | Norway, Mandal, Store Elvegate 35 | 1973-11-10 | 1997-11-20 | 1973–2006 | 10 | |
| Miłośnicy Sceny | Miłośnicy Sceny | Poland, Warsaw | 1903-02-08 | 1903-03-15 | 1903 | 1 | |
| Mapol Motion Pictures Studios | Mapol Motion Pictures Studios | Argentina, Buenos Aires | 1954-01-27 | -- | 1954 | 1 | |
| Muhsin Ertugrul Sahnesi | Muhsin Ertugrul Sahnesi | Turkey, Istanbul, Harbiye Mh., Darülbedayi Cd. No:3 | 1998-05-30 | 2018-04-28 | 1998–2019 | 3 | |
| Madlenianum Opera & Theatre | Madlenianum Opera & Theatre | Serbia, Belgrade, Glavna 32 | 2011-12-10 | -- | 2011 | 1 | |
| Mukačeve | Mukačeve | Ukraine, Mukačeve | 1909-01- | 1927-03-08 | 1909–1941 | 8 | |
| Masonic Temple | Masonic Temple | United States, Portland | 1910-02-28 | 1910-02-28 | 1910 | 1 | |
| Mehregan Theater | Mehregan Theater | Iran, Tehran, District 11, Enghelab St, Khark St. | 2019-07-06 | 2021-09-10 | 2019–2021 | 2 | |
| Margarethakirkens ruin, Maridalen | Margarethakirkens ruin, Maridalen | Norway, Oslo | 1985-08-17 | 1985-08-25 | 1985 | 1 | |
| Middlesbrough Theatre | Middlesbrough Theatre | England, Middlesbrough, The Avenue | 2005-03-31 | 2005-04-01 | 2005–2011 | 2 | |
| Musical Theatre Works (MTW) | Musical Theatre Works (MTW) | United States, New York | 2000-11-03 | 2000-11-12 | 2000 | 1 | |
| Miljøbygget | Miljøbygget | Norway, Tana, Tana | 1983-11-15 | -- | 1983–2007 | 2 | |
| Mosjøen Kino og Teater | Mosjøen Kino og Teater | Norway, Mosjøen, Kinoplassen 2 | 1959-02-16 | -- | 1959–2022 | 11 | |
| Moray House Theatre | Moray House Theatre | Scotland, Edinburgh | 1969-11-25 | -- | 1969 | 1 | |
| Multnomah Hotel | Multnomah Hotel | United States, Portland | 1912-11-22 | 1912-11-22 | 1912 | 1 | |
| Marshall Performing Arts Center - Dudley Experimental Theatre | Marshall Performing Arts Center - Dudley Experimental Theatre | United States | 2020-01-17 | 2020-01-17 | 2020 | 1 | |
| Mechanics Institute Performing Arts Centre | Mechanics Institute Performing Arts Centre | Australia, Brunswick, 270 Sydney Rd | 2004-07-22 | 2004-08-08 | 2004 | 1 | |
| Max-Reger-Halle | Max-Reger-Halle | Germany, Weiden in der Oberpfalz, Dr.-Pfleger-Straße 17 | 2005-09-26 | -- | 2005 | 1 | |
| Maryland Theatre | Maryland Theatre | United States, Baltimore | 1903-10-21 | 1903-10-21 | 1903 | 1 | |
| Městské divadlo Na hradbách | Městské divadlo Na hradbách | Czech Republic, Brno | 1920-01-31 | -- | 1920–1928 | 3 | |
| Merchant’s House Museum | Merchant’s House Museum | United States, New York, 29 E 4th St | 2011-07-07 | 2011-07-17 | 2011 | 1 | |
| Melhus rådhus | Melhus rådhus | Norway, Melhus, Rådhusvegen 2 | 1983-10-12 | 2015-10-10 | 1983–2022 | 13 | |
| Mecklenburgisches Landestheater Stralsund | Mecklenburgisches Landestheater Stralsund | Germany, Stralsund | 1950-09-10 | 1950-10-20 | 1950 | 1 | |
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