Name
- Leiningen, Prince of, of Add MS 472942
- Lieven, Christoph Heinrich, Prince, Russian diplomatist2
- Lieven, Karl Christoph, Prince, eldest son of Baron O H Lieven2
- Lomonosov, Sergei Grigorovich, Russian diplomatist2
- Löschern, Karl, Russian army officer2
- Löwis, Friedrich, of Menar; Russian general2
- Lützow, of Mecklenburg-Schwerin2
- Maitland, James, 8th Earl of Lauderdale2
- Mappes, Henry and Conrad, wine merchants, of Mainz and Hattenheim2
- Marianne, wife of Prince William of Prussia, brother of Frederick William III2
- Marine Society2
- Menshikov, Aleksandr Sergeevich, Prince, Russian statesman, 1787-18672
- Mentzingen, Antoinette, of Baden2
- Merle, Gibbons, journalist2
- Merveldt, Maximilian, General Count; afterwards Austrian Ambassador in London2
- Mills, George, of the Diplomatic Service; of Add MS 472862
- Mitchell, John, of Add MS 472892
- Moltke, Carl Emil, Count, Danish Minister in London2
- Molé, Louis Matthieu, Comte, French Foreign Minister2
- Montmorency-Laval, Anne Pierre Adrien, Duc de, French Ambassador in London2