- Milne, John
- Milner, Alfred Milner, Viscount
- Milovanović, Milovan G.
- Milyukov, Paul Nikolayevich
- Minchin, Edward Alfred
- Mineralogy
- Minesweeping and Minelaying
- Mining
- Mining, Military
- Minnesota
- Minto, Gilbert John Ellitt-Murray-Kynynmond, 4th Earl of
- Mišić, Živojin
- Mississippi
- Missouri
- Mistral, Frédéric
- Mitchell, Silas Weir
- Mohn, Henrik
- Molesworth, Mary Louisa
- Moltke, Helmuth von
- Mond, Sir Alfred Moritz
- Monet, Claude
- Money Market
- Mongolia
- Monod, Gabriel
- Monro, Sir Charles Carmichael
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- Montagu, Edwin Samuel
- Montana
- Montenegro
- Montero Rios, Eugenio
- Montessori System
- Montreal
- Monypenny, William Flavelle
- Moody, William Vaughn
- Moore, George
- Moore, Thomas Sturge
- Moorhouse, James
- Morant, Sir Robert Laurie
- Moret y Prendergast, Segismundo
- Morgan, John Pierpont
- Morley of Blackburn, John Morley, Viscount
- Morocco
- Morris, Edward Patrick Morris, 1st Baron
- Morrison, George Ernest
- Morton, Levi Parsons
- Mosby, John Singleton
- Moseley, Henry Gwyn Jeffreys
- Moss, Sir (Horace) Edward
- Motor Transport, Military
- Motor Vehicles
- Mottl, Felix
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- Moule, Handley Carr Glyn
- Moulton, John Fletcher Moulton, Baron
- Mounet-Sully, Jean
- Mounted Troops
- Mount Stephen, George Stephen, 1st Baron
- Moving or Motion Pictures
- Muir, John
- Muirhead, Alexander
- Müller, Hermann
- Mun, Adrien Albert Marie de, Count
- Munitions of War
- Munsey, Frank Andrew
- Münsterberg, Hugo
- Murkland, William Urwick
- Murphy, Charles Francis
- Murphy, Fred Towsley
- Murray, Sir Archibald James
- Murray, Charles Fairfax
- Murray, George Gilbert Aimé
- Murray, George Robert Milne
- Murray, Sir James Augustus Henry
- Murray, Sir John
- Murray of Elibank, Alexander William Charles Oliphant Murray, 1st Baron
- Music
- Mustapha Kemal
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- Mutsu Hito
- Namur
- Nansen, Fridtjof
- Naoroji, Dadabhai
- Naquet, Alfred Joseph
- Nares, Sir George Strong
- Narew, Battles of the
- Naroch Lake
- Natal
- Nathan, Ernesto
- National Debt
- Nationalization
- Naval History of the War
- Navies
- Navy, Department of the
- Neal, David Dalhoff
- Nebraska
- Negro
- Nénot, Paul Henri
- Nervous System
- Netherlands India
- Nevada
- Nevill, Lady Dorothy Fanny
- Neville, Sir Ralph
- Newbolt, Sir Henry John
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