Name
- Malcolm, James1
- Mallet, John Lewis, Secretary of the Audit Office1
- Mangles, Henry C-1
- Marlay, Richard, Bishop of Waterford1
- Marsden, William, orientalist and numismatist, 1754-18361
- Marshall, Edward, of Add MS 378801
- Maskelyne, Nevil, DD, FRS; Astronomer Royal1
- Massingall, Anthony1
- McMahon, John, 1st Baronet 1817, Colonel; Secretary to the Prince of Wales1
- Metcalfe, P-1
- Meuron, Comte de1
- Mildmay, Henry Paulet St. John, 3rd Baronet, MP1
- Miller, John, of Add MS 378791
- Money, Charles Berkeley, Major1
- Monson, John, pseudomyn1
- Morgan, William, actuary1
- Morres, Lodge Evans, Chief Secretary to the Lord Lieutenant of Ireland1
- Mosley, Oswald, 2nd Baronet1
- Mulcaster, Frederick George, Colonel; of Add MS 378751
- Muller, P-1