Name
- Merveldt, Maximilian, General Count; afterwards Austrian Ambassador in London1
- Mettemberg, Joseph, medical practitioner1
- Metzgern, Johanne, Frau; of Berlin1
- Meyendorff, A.?, Baron1
- Meyer, Brüxner and Co, bankers, St Petersburg1
- Michael Pavlovich, Grand Duke of Russia1
- Milbanke, John Ralph, 8th Baronet, afterwards Milbanke-Huskisson; Minister at The Hague1
- Mitchell, John, of Add MS 472891
- Mitford, John Freeman-, 1st Baron Redesdale, Lord Chancellor of Ireland, 1748-18301
- Moberly, John, Captain; RN1
- Mocenigo, Georgii Dmitrievich, Count, Russian diplomatist1
- Molchanov, Russian senator1
- Montmorency-Laval, Anne Pierre Adrien, Duc de, French Ambassador in London1
- Montmorency-Laval, Comte de Laval1
- Mordrinov, Nikolai Simeonovich, Count1
- Moreno y Daviz, Pantaléon, Spanish Minister in Stockholm1
- Morgenstern, Johann Carl Simon, Professor of Classics at Dorpat1
- Morier, John Philip, diplomat, 1778-18531
- Münster, Ernst Friedrich Herbert zu, Count Hanoverian Minister in London1
- Naryshkin, Mikhail1