Name
- Maffei, A., Count, of the Italian Legation in London1
- Majendie, Ashhurst, of Hedingham Castle1
- Major, Richard Henry, Keeper of Printed Maps and Plans British Museum1
- Malden, Henry, classical scholar1
- Mallet, Robert, FRS, civil engineer1
- Maltby, Edward, Bishop of Durham, 1770-18591
- Mangles, James, Captain; RN, FRS1
- 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