- m ... M45
- M47 ... Mab
- Maba ... MacArthur, Catherine
- MacArthur, Charles ... Macdonald, Margaret
- Macdonald, Norm ... Machado y Ruiz, Manuel
- Machado, Antonio ... macinato
- MacInnes, Colin ... Maclaren, Charles
- Maclaren, Ian ... macrauchenid
- Macready, George ... Macunaíma
- Macune, Charles W. ... Madariaga y Rojo, Salvador de
- Madāʾin Ṣāliḥ ... Madhya Pradesh
- Madhyadesh ... Madonna lily
- Madonna of Carmelo and the Souls of Purgatory ... Maebashi
- Maecenas, Gaius ... Magangué
- Magar ... Magic Camp
- Magic Christian, The ... magnesium deficiency
- magnesium germanate ... magneto-optical shutter
- magneto-sonic wave ... Magnus Barn-lock
- Magnus Berrfott ... Maha-Vairocana
- Mahābād ... Mahathir bin Muhammed
- Mahatma Gandhi ... Mahmud
- Maḥmud ... maidenhair fern family
- maidenhair tree ... Maina Polypyrgos
- Mainard, François ... Maitland of Lexington, William
- Maitland Quarto MS ... Major League Soccer
- major life zone ... Makedhonía
- Makedonía ... Makú
- Makua ... Malan, Daniel François
- Malan, François Stephanus ... Malbone, Edward Greene
- Malbork ... Malesherbes, Chrétien Guillaume de Lamoignon de
- Malesherbiaceae ... Malini, Hema
- Malini, Max ... Malo
- Malo ... malting
- Malto language ... mamba
- Mamba’s Daughters ... Man and the Masses
- Man as an End ... Man Who Loved Children, The
- Man Who Married a Dumb Wife, The ... Managua, Lake
- Managua, Treaty of ... Manchu-Tungus languages
- Manchuguo ... Mander, Karel van
- Mander, Mary Jane ... mangabey
- Mangaia ... Manhattan
- Manhattan Beach ... Maninka
- Maninkakan ... Mann, Michael
- Mann, Michael ... Manqo ’Inka Yupanki
- Manqo Qhapaq ... Mantellate Sisters
- Mantellidae ... Manuale tipografico
- Manubo-Blit ... Manzoni Family, The
- Manzoni, Alessandro ... Mapuche language
- Mapun ... Maranao
- Marandellas ... MARC
- Marc ... Marche
- Marche ... Marcy, William Learned
- Marczincsák, György Pál ... Margaret
- Margaret ... Margot, Queen
- Margot, Queen ... Mariana
- Mariana Islands ... Mariinsky Theatre
- Marijampolė ... marinheiro, O
- Marini, Biagio ... Marivaux, Pierre
- Marivaux, Pierre Carlet de Chamblain de ... Markey, Edward John
- Markham River ... Marmor
- Marmor Norfolciense ... Márquez, Juan Manuel
- Marquina, Eduardo ... Mars Pathfinder
- Mars Polar Lander ... Marshall University
- Marshall, Alfred ... Martens, Fyodor Fyodorovich
- Martens, Georg Friedrich von ... Martin, George Raymond
- Martin, George Raymond Richard ... Martini, Giovanni Battista
- Martini, Ignaz ... Marvelous Mrs. Maisel, The
- Marvels, the ... Maryinsky Theatre
- Maryknoll Sisters of St. Dominic ... mascot
- Mascots, the ... masked hunter
- masked polecat ... Masquerades and Operas
- Maṣraf Qatar al-Markazī ... Massalia
- Massamba-Débat, Alphonse ... Master Honoré
- Master i Margarita ... Masvingo
- Maṣyāf ... maté
- Maté, Rudolph ... Mathematico-Deductive Theory of Rote Learning
- mathematics ... Matka
- MATLAB ... Matsuo Munefusa
- Matsuoka Yosuke ... Matthiae, Paolo
- Matthias ... Mauermayer, Gisela
- Maues ... Mauritius, flag of
- Maurits, Prins van Oranje, Graaf van Nassau ... Maxentius, Basilica of
- Maxentius, Marcus Aurelius Valerius ... May
- May 1968, events of ... Mayer, Julius Robert von
- Mayer, Kevin ... Mayr, Michael
- Mayr, Simon ... Mazurkiewicz, Stefan
- Mazurskie Lakeland ... MCA
- MCAD ... McCauly, Mary
- McCauly, Mary Ludwig Hays ... McCullough, David
- McCullough, David Gaub ... MCGM
- McGorry, Patrick ... McKenzie, Sir John
- McKenzie, Susan ... McMillan Commission
- McMillan Plan ... Md
- MDA ... mean sea level
- Mean Season, The ... Mecelle
- Méchain, Pierre ... Meckenem, Israhel van
- Mecklenburg ... mediastinoscope
- mediastinoscopy ... Medici, Villa
- Medici-Riccardi Palace ... Mediterranean gecko
- Mediterranean gull ... Meek’s Cutoff
- Meek, Donald ... Megalópolis
- Megalopolis ... Mehldau, Brad
- Mehldau, Bradford Alexander ... Meine frühesten Erlebnisse
- Meine Nachforschungen über den Gang der Natur in der Entwicklung des Menschengeschlechts ... Mekri carpet
- Mel B. ... Melbourne Park
- Melbourne Public Library ... mellay
- Melle Mel ... meltdown
- melteigite ... Mémoire sur le système primitif des voyelles dans les langues indo-européennes
- Mémoire tatouée, La ... memory cache
- memory continuity ... Menander Protector
- Menaphon ... Menedemus of Eretria
- Meneer Vissers hellevaart ... Menispermum
- Menispermum canadense ... mental health
- Mental Health Act ... Merbabu, Mount
- Merbecke, John ... Merci, Franz, Freiherr von
- Mercia ... Meredith, George
- Meredith, James ... Meriwether, Elizabeth
- Meriwether, Lee ... Merrick, Joseph Carey
- Merrie Melodies ... merubbaʿ pen hand
- merubbaʿ script ... Meskhet
- Meskheti ... Mespilus
- Mespilus canescens ... Messmer, Otto
- Messner, Reinhold ... metal-matrix composite material
- metal-organic chemical vapour deposition ... Metaphysische Anfangsgründe der Naturwissenschaft
- Metaphyta ... meteoritics
- Meteoritics and Planetary Science ... Methods of Mathematical Physics
- Methodus Incrementorum Directa et Inversa ... Metridium
- metriotes ... Meuseland
- MeV ... México
- Mexico ... mezzo-relievo
- mezzo-soprano ... Mianyang
- Miao ... Michaud, Code
- Michaud, Joseph ... Mickiewicz, Adam
- Mickiewicz, Adam Bernard ... Microdipodops
- Microdipodops megacephalus ... microRNA
- Microryzomys ... Mid Devon
- Mid Suffolk ... middle lamella
- Middle Lithuanian Lowland ... Midhat Pasha
- Midhe ... Midwestern State University
- Midwich Cuckoos, The ... mignonette, garden
- mignonette-vine ... miko
- Mikołaj I ... Miles Davis Quintet
- Miles Gloriosus ... military medicine
- military monkey ... Millaran Culture
- Millard House ... Miller, Jonathan
- Miller, Jonny Lee ... millipede
- millisecond delay cap ... Milton, John
- Milton, Mary Powell ... Min Mountains
- Min Pin ... mind-stuff
- Mind: An Essay on Human Feeling ... Mines, United States Bureau of
- minesweeper ... minimal religion
- minimal surface ... Minnesänger
- Minnesinger ... Minotaur
- Minotauros ... Mīr Jaʿfar
- Mīr Maḥmūd ... Miranda’s Book
- Miranda, Bartolomé de ... Mirrors, Hall of
- Mirrors, Palace of ... Mishnaic Hebrew language
- Mishnayot ... missense mutation
- missi comitis ... Mississippi Southern College
- Mississippi State College ... MIT Radiation Laboratory
- mita ... Mithridates VI Eupator Dionysus
- Mithridates, oder allgemeine Sprachenkunde ... mitsvoth
- Mittag-Leffler theorem ... Miyagawa Chōshun
- Miyagawa Nagaharu ... MLS
- MLS ... Moawad, René
- Moawad, René Anis ... Mochnacki, Maurycy
- Mochokidae ... Moderate Soprano, The
- Moderate, The ... modes, theory of the
- Modest Enquiry into the Nature and Necessity of a Paper Currency, A ... Moesia
- Moeti oa Bochabela ... Mohammed, W. Deen
- Mohammed, Warith Deen ... Mojing
- Mojmír I ... mole drainage
- mole fraction ... Mollejon Dam
- Mollen Commission ... Mombacho
- Mombasa ... Monarchos
- monarchy ... Monetary History of the United States 1867–1960, A
- monetary policy ... Monias benschi
- Monica, Saint ... Monnaie
- monnaie tournois ... Monomakh, Vladimir Vsevolodovich
- monomane ... Monroe, James
- Monroe, James P. ... Mont Pèlerin Society
- Mont Sainte-Anne ... Montcalm, Louis-Joseph de Montcalm-Grozon, marquis de
- Montchrestien, Antoine de ... Montessori Method, The
- Montessori schools ... Montluçon
- Montmartre ... Monuments de l’Égypte et Nubie
- Monuments des arts du dessin chez les peuples tant anciens que modernes ... Mooney, Nellie
- Mooney, Thomas Joseph ... Moore, Julia A.
- Moore, Julianne ... Moral Disorder
- Moral Economy of the English Crowd in the Eighteenth Century, The ... Moray, cathedral of
- Moray, James Stewart, 1st Earl of ... morenada
- Morenci ... Morgan, William
- Morgan, William G. ... Morley, Christopher
- Morley, Christopher Darlington ... Moroni, Giovanni Battista
- Moronidae ... Morris, Nathan Bartholomew
- Morris, Nelson ... Mortal Acts, Mortal Words
- Mortal Danger, The ... Morven
- Morven ... Moseley’s law
- Moseley, Carol ... Mosquito Coast, The
- Mosquito Coast, The ... moth flower
- moth fly ... Motion Picture Arts and Sciences, Academy of
- Motion Picture Association ... motorcycle ice racing
- motorcycle racing ... Mounana
- mound builder ... Mountain Ash
- mountain avens ... Mountford, Cecil
- Mountford, Ces ... Mouvement pour le Triomphe des Libertés Démocratiques
- Mouvement Républicain Populaire ... moving picture
- moving picture experts group ... Mozi
- Mozi ... Mr. Holland’s Opus
- Mr. Holmes ... Mrs. Winterbourne
- MRSA ... muahiset
- Muan ... Mudanjiang
- Mudanting ... mugi miso
- Mugia, Deo ... Muḥammad Ture
- Muḥammad Turée ... Mukachiv
- Mukai Chiaki ... Mulhall, Lucille
- Mülhausen ... Müllner, Amadeus Gottfried Adolf
- Mullus barbatus ... multiple peripheral neuritis
- multiple personality ... Mumford, Lewis
- Mumford, Marcus ... Mundy, William
- Müneccimbaşı, Ahmed Dede ... Munson, Margaret Elizabeth
- Munson, W. A. ... Murad River
- Murad V ... Murdoch, Walter
- Murdoch, William ... Murphy, Gerald; and Murphy, Sara
- Murphy, Gerard ... Murry, John Middleton
- Murry, Kathleen ... Mūsawī, ʿAbbās al-
- Muṣawwar, Al- ... Museo Nazionale del Bargello
- Museo Nazionale della Scienza e della Tecnologia Leonardo da Vinci ... Music for Millions
- Music for the Royal Fireworks ... Musil, Robert
- Musil, Robert, Edler von ... Mussorgsky, Modest Petrovich
- Mussuh ... Mutation Theory, The
- mutation-rate doubling dose ... Muybridge, Eadweard
- Muyua Island ... My Best Friend’s Wedding
- My Birth ... My Lifetime in Letters
- My Little Chickadee ... MYCN
- mycobacteria other than tuberculosis ... Myliobatidae
- Myliobatis californicus ... Mýrdals Glacier
- Mýrdalsjökull ... Mysteries of Udolpho, The
- Mysteries, Villa of the ... Myxobolus pfeifferi
- myxomatosis ... Mʾzabite