Name
- Maclean, Charles Donald, of the Indian civil service, composer1
- Mann, Harold L, member of RMA1
- Mann, William Somervell, writer on music, 1924-19891
- Manén, Lucie, member of RMA1
- Marlow, Richard Kenneth, organist and director of music1
- Marsden, Ernest G N, son of Newton Marsden of RMA1
- Martin, J McKay, musician, fl 1920-19501
- Masini, George A, of Malta1
- Matthews, Betty, writer on church music1
- Maxted, Ivan, member of RMA1
- Mayer, Robert, Knight, music patron, 1879-19851
- Mayfair Catering Company Ltd1
- Mecca Ltd1
- Mechanical-Copyright Protection Society Ltd, 1924-1
- Meikle, Robert B, member of RMA1
- Mellers, Wilfrid Howard, composer and musicologist, 1914-20081
- Merrick, Frank, pianist and composer1
- Meyer, Ernst Hermann, composer and musicologist, alias Peter Baker, 1905-19881
- Middlesex County Council, 1889-19631
- Middleton, Hubert Stanley, musicologist1