Name
- Markham, Clements Robert, Knight, geographer, 1830-19161
- Martin, Robert Montgomery, colonial historian1
- Martin, William, of the Lord Chamberlain's Office1
- May, D., Master, RN1
- Melville, William Henry Leslie, Director, HEIC1
- Merivale, Herman, DCL, Indian Under-Sec1
- Meyendorff, Petr Kazimirovich, Baron, of the Russian Foreign Office1
- Meyer, of Add MS 461271
- Middendorff, Aleksander Theodorovich, Russian naturalist1
- Milne-Home, David, of Milne Graden1
- Milnes, Richard Monckton, 1st Baron Houghton1
- Moat, William C., MRCS1
- Monk, William, FSA; Rector of Wymington 18641
- Morgan, Sydney, novelist; wife of Sir TC Morgan1
- Morritt, John Bacon Sawrey, MP; classical scholar1
- Mosquera, Tomas Cipriano, Colombian Minister in London1
- Mueller, Ferdinand, Baron1
- Mundy, Godfrey Charles, author1
- Muravieff, Michael Nikolaevich1
- Murchison, Roderick Impey, 1st Baronet, geologist, 1792-18711