This lists all identified correspondents. Their letters can only be accessed through the Letters page.
Mantzius, Karl, 1860-1921 Danish actor, manager, theatre historian
Mapleson, (James) Henry, 1830-1901 Colonel, singer, opera impresario
Mapleson, Maria Hippolyte "Marie Rôze", née Ponsin, Mrs Henry, 1846-1926 soprano singer, earlier married to J.E. Perkins
Marbury, Elizabeth, 1856-1933 American international dramatists' agent
March, Thomas Charles, fl.1836-96 Buckingham Palace paymaster
Marchesi, Blanche, 1863-1940 mezzo-soprano singer
Margetson, William Henry, 1861-1940 designer, painter, illustrator
Marion, W. Lyceum super
Mark, H.H. solicitor?
Marlborough Club (Charles H. Stone, RN, Secretary)
Marlowe, Julia, (r.n. Sarah Frances Frost), 1866-1950 American actress
Marquand, Allan, 1853-1924 art historian
Marra, Francesco A. painter, a friend of Salvini
Marryat, Florence, Mrs Thomas Church, later Mrs Francis Lean, 1833-1899 actress, playwright, novelist
Marsh, Mrs possibly a relative of the actor Henry Marston (Richard Henry Marsh)