This lists all identified correspondents. Their letters can only be accessed through the Letters page.
Mary, Queen Consort of George V, (Victoria Mary Augusta Louise), 1867-1953 (as Victoria Mary, Princess of Teck)
Maskelyne, John Nevil, 1839-1917 mechanical & optical illusionist
Massingham, Henry William, 1860-1924 journalist, editor of The Daily Chronicle
Matheson 1890 (Matthison?)
Mathews, Charles James, 1803-1878 actor
Mathews, Sir Charles Willie, né West, 1850-1920 barrister, DPP, stepson of C.J. Mathews
Mathews, Elizabeth "Lizzie Weston", nèe Jackson, Mrs Charles James, 1806-1899 signing herself Mrs Charley, earlier married to A.H. Davenport Hoyt, and possibly William Weston
Mathews, Frances Aymar, d.1923 American dramatist
Matthews, Helen, Mrs W.H. Brunton, b.1827 actress
Matthews, Henry, 1st Viscount Llandaff, 1826-1913 Home Secretary
Matthews, James Brander, 1852-1929 professor of literature, author
Matthison, Arthur, 1825/26-1883 actor
Matthison, Edith Wynne, 1875-1955 actress
Maude, Cyril, 1862-1951 actor
Maugham, Henry Neville, 1868-1904 playwright