- Meyer, Adolf
- Meyer, Adolf Bernhard
- Meyer, Annie Nathan
- Meyer, Balthasar Henry
- Meyer, Conrad Ferdinand
- Meyer, Eduard
- Meyer, George von Lengerke
- Meyer, Hans
- Meyer, Heinrich August Wilhelm
- Meyer, Henry Herman
- Meyer, Hugo Richard
- Meyer, Johann Georg
- Meyer, Joseph
- Meyer, Kuno
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- Migration
- Miguel, Maria Evaristo
- Mikado
- Mikado, The
- Mikania
- Mikhailov, Mikhail Larionovitch
- Mikhailovski, Nikolai Konstantinovitch
- Mikkelsen, Aksel
- Mikkelsen, Ejnar
- Miklosich, Franz von
- Milan
- Milan (Missouri)
- Milan (Tennessee)
- Miller, Cincinnatus Heine
- Miller, Ferdinand von
- Miller, Ferdinand, Baron von
- Miller, Florence Fenwick
- Milligan, Ex Parte
- Mills, Roger Quarles
- Mimicry in Animals
- Mineralogy
- Mitsukuri, Kakachi
- Mittermaier, Karl Joseph Anton
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- Modjeska, Helena
- Modjeski, Ralph
- Modulus
- Moe, Jörgen Ingebretsen
- Moebius, August Ferdinand
- Moeller, Henry
- Moeller, Louis
- Mœris
- Moldenke, Charles Edward
- Möllhausen, Baldwin
- Monroe, Harriet
- Monroe, James
- Monroe (Louisiana)
- Monroe (Michigan)
- Monroe (North Carolina)
- Monroe (Wisconsin)
- Monroe Doctrine, The
- Monrovia (California)
- Monrovia (Liberia)
- Montessori, Maria
- Monteverde, Claudio
- Montez, Lola
- Moore, George Henry
- Moore, Jacob Bailey
- Mörike, Eduard
- Morisot, Berthe
- Moritz, Karl Philipp
- Mormons
- Morte d'Arthur
- Morten-Müller
- Morton, Henry
- Morton, Thomas (colonist)
- Morton, William James
- Morton, William Thomas Green
- Mosheim, Johann Lorenz von
- Mosher, Eliza Maria
- Moskva
- Moslem
- Mosler, Henry
- Mosque
- Mosquera y Arboleda, Tomás Cipriano de
- Mount Holyoke College
- Mouse
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- Muir, John (naturalist)
- Mullein
- Müller, Adam Heinrich
- Müller, Charles Louis
- Müller, Friedrich
- Müller, Friedrich Max
- Müller, Georg Friedrich
- Müller, Johann Friedrich Theodor
- Müller, Johann Gotthard von
- Müller, Johannes
- Müller, Johannes von
- Müller, Julius
- Müller, Karl Otfried
- Müller, Morten
- Müller, Victor
- Müller, Wilhelm
- Müller, Wilhelm Max
- Muller, William James
- Muller-Ury, Adolfo
- Mullet
- Munsee Indians
- Munsell, Joel
- Munsey, Frank Andrew
- Munson, James Eugene
- Munson, Thomas Volney
- Munster
- Münster
- Münsterberg, Hugo
- Mycorriza
- Nagel, Albrecht Eduard
- Nagel, Charles
- Nägeli, Karl Wilhelm
- Naglee, Henry Morris
- Nagoya
- Nagpur
- National Library of France
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