- MacArthur, Charles, 1
- MacCarthy, Desmond, 1
- MacDonald, J. Ramsay, 1
- McDouall, Robin, 1
- McEvoy, Ambrose, 1, 2
- McEwen, Bridget, Lady, 1, 2, 3, 4, 5
- MacLaglen, Victor, 1, 2
- McLaren, Moray, 1
- Maclean, Veronica, Lady, 1
- MacLeish, Archibald, 1
- Macmillan, Harold, 1, 2, 3, 4, 5
- MacNamara, Robert, 1
- McNeill, Ronald (later Lord Cushenden), 1
- Manchester, William A. D. Montagu, 9th Duke of, 1
- Manners, Francis Henry, 4th Baron, 1, 2
- Manners, Haddon, 1
- Manners, John, see Rutland, John Manners, 9th Duke of
- Manners, Lady Katherine (Aunt Kitty), 1
- Manners, Mary Edith, Lady, 1, 2
- Manuel, King of Spain, 1, 2, 3
- Marconi, Guglielmo, 1
- Margaret, Princess, 1, 2, 3
- Marie, Queen of Rumania, 1
- Marsh, Sir Edward, 1, 2, 3, 4
- Marshall, General George, 1
- Mary, Queen, 1, 2
- Mason, A. E. W., 1
- Massigli, Odette, 1
- Massigli, René, 1, 2
- Massine, Léonide, 1
- Mathieu, Marie, 1
- Maugham, W. Somerset, 1
- Mauriac, François, 1, 2, 3
- Mayall, Lees, 1, 2
- Mayer, Sir Robert, 1, 2
- Melba, Dame Nellie, 1, 2
- Mendès-France, Pierre, 1, 2
- Mells (house), 1, 2
- Menzies, Sir Robert, 1
- Meredith, George, 1, 2
- Messel, Oliver, 1, 2
- Meynell, Alice, 1
- Miller, Arthur, 1
- Miller, Gilbert, 1
- Milne, A. A., 1
- Miracle, The, 1, 2;
- in USA, 1, 2, 3;
- in Europe, 1, 2;
- London production (1932), 1;
- English tour, 1;
- revived, 1
- Mitford, Nancy, 1, 2, 3, 4, 5
- Moffat, Curtis, 1
- Moffat, Iris, see Tree, Iris
- Molyneux, Captain Edward, 1
- Monckton, Walter (later 1st Viscount), 1
- Mond, Sir Alfred, 1
- Monroe, Marilyn, 1
- Montagu, Edwin: and Diana’s drug-taking, 1;
- marriage, 1, 2;
- friendship with Diana, 1, 2, 3, 4, 5, 6, 7, 8;
- in air raids, 1;
- on Asquith, 1;
- opposes Duff as Diana’s husband, 1;
- at Paris Peace Conference, 1;
- and Conrad Russell, 1;
- Diana on, 1
- Montagu, Stewart Albert Samuel (later 3rd Baron Swaythling; ‘Cardie’), 1
- Montagu, Venetia (née Stanley): friendship with Diana, 1, 2, 3, 4, 5, 6, 7, 8, 9;
- character, 1;
- and Asquith, 1;
- marriage 1, 2;
- and Lloyd George, 1;
- and Beaverbrook, 1, 2, 3;
- and Duff’s gambling losses, 1;
- trip to Germany, 1;
-
- and Burckhardt, 1;
- at Dorchester Hotel in war, 1;
- and Duff in India, 1;
- at Paris Embassy, 1;
- illness, 1
- Montgomery, Field-Marshal Bernard Law, 1st Viscount, 1
- Moore, George Gordon, 1, 2, 3, 4
- Moore, Henry, 1
- Moorehead, Alan, 1, 2
- Moran, Charles McMoran Wilson, 1st Baron, 1, 2
- Morrell, Lady Ottoline, 1
- Morrison, Herbert (later Baron), 1
- Mortimer, Raymond, 1, 2
- Mosley, Nicholas, 1
- Mosley, Sir Oswald, 1, 2
- Mossman, James, 1
- Mountbatten, Edwina (later Countess), 1, 2
- Mountbatten, Lord Louis (later 1st Earl), 1, 2, 3
- Mowbray, William M. Stourton, 25th Baron, and Sheila, Lady, 1
- Muggeridge, Malcolm, 1