- M ... M44
- M45 ... Maazel, Lorin Varencove
- Mab ... MacArthur Foundation
- MacArthur Park ... Macdonald, John Ross
- Macdonald, John Sandfield ... MacHack VI
- Machačkala ... Machupo virus disease
- machzor ... Macklin, Charles
- Macklin, Wicked Charlie ... Macquarie Harbour
- Macquarie Island ... Mactan Island
- Macua language ... Madan
- Madanapala ... Madhubala
- Madhubani ... Madonna and Martin van Nieuwenhove
- Madonna and Saints ... Madvig, Johan Nicolai
- Madwoman of Chaillot, The ... MAGA movement
- Maga, Hubert ... Maghnia
- Maghreb ... Magnasco, Alessandro
- Magnavox Company ... Magnetic South Pole
- magnetic spin quantum number ... Magnolia quinquipeta
- Magnolia sieboldii ... Magyar Demokrata Fórum
- Magyar Köztársaság ... mahārāja
- maharajah ... Mahillon, Victor-Charles
- Mahilyou ... Maiano, Benedetto da
- Maianthemum racemosum ... main entry
- main gasing ... Maison du Peuple
- Maison du Peuple, La ... Majnūn and Laylā
- Majnūn Laylā ... makaris
- Makarov Basin ... Makkī, ʿAmr ibn ʿUthmān al-
- Makkiyyah ... Maladzyechna
- Málaga ... Malayalam language
- Malayalam literature ... male oscuro, Il
- male pattern baldness ... Malik al-Ṣāliḥ Najm ad-Dīn Ayyūb, al-
- Malik al-Ẓāhir Rukn al-Dīn Baybars al-Bunduqdārī, al- ... Malleus maleficarum
- Malley, Ern ... malquerida, La
- Malraux, André ... malware
- Malwi language ... Mammoth Hotel
- Mammoth Hunters, The ... Man of a Thousand Faces
- Man of England Now ... Man, Paul de
- man, philosophy of ... Manawatu River
- Manawatū-Whanganui ... mandara painting
- mandarin ... Mandurah
- Manduria ... Mangghystaū
- Mangiarotti, Edoardo ... Manifeste du théâtre de la cruauté
- manifesting heterozygote ... Manīʿah, al-
- manjak ... Mannheim, Amédée
- Mannheim, Karl ... Mansi language
- Mansingh, Sonal ... Mantle, Mickey
- Mantle, Mickey Charles ... manus
- Manus Island ... MAP
- Map and the Territory, The ... Mar-a-Lago
- Mar-a-Lago Club, the ... Maratta, Carlo
- Maratti, Carlo ... March Air Force Base
- March Air Reserve Base ... Marco Polo Bridge Incident
- Marco Polo sheep ... Mare Ionio
- Mare Ionium ... Margarita de Parma
- Margarita Island ... Mari Letters
- maria ... Marie
- Marie Adélaïde ... marine animal
- Marine Animal Populations, Future of ... Marion Island
- Marion, Frances ... Mark of the Angel, The
- Mark of the Vampire ... Markovitch, Henrietta Theodora
- Markovnikov rule ... Maroboduus
- Marochetti, Carlo ... marriage
- Marriage à la Mode ... Marsalis, Delfeayo
- Marsalis, Ellis ... Marshall, Paule
- Marshall, Penny ... Martha Stewart Living Omnimedia, Inc.
- Martha Washington geranium ... Martin, Lillie Jane
- Martin, Lillien Jane ... Martins, Peter
- Martinsburg ... Marx Brothers
- Marx, Adolpho Arthur ... Marymount School
- Marymount schools ... Maserati
- Maserati SpA ... masking phenomenon
- Masks ... mass action
- mass action, law of ... Masse-Mensch
- Massena ... Master of Petersburg, The
- Master of Puppets ... Masʿūd III
- Masʿūd Saʿd Salmān ... Mateo Falcone
- mater ... mathematics, philosophy of
- Mathematics, Queen and Servant of Science ... Matlin, Marlee
- Matlin, Marlee Beth ... Matsushita Denki Sangyō Kk
- Matsushita Electric Industrial Company ... Matthias
- Matthias I ... Maudite Galette, La
- Maudslay, Henry ... Mauritanide Mountains
- Mauritanie ... Max-Planck-Gesellschaft zur Forderung der Wissenschaften
- Maxakali ... Maxwell, Jody-Anne
- Maxwell, Marilyn ... Mayenne River
- Mayenne, Charles de Lorraine, duc de ... Mayor, Plaza
- Mayor, Plaza ... Mazovian
- Mazovian Lowland ... MBS
- MBT ... McCarthy, Mary
- McCarthy, Mary Therese ... McCracken, James Eugene
- McCracken, Robert ... McFadden, Bernard Adolphus
- McFadden, Daniel L. ... McInnes, Thomas Robert Edward
- McIntire, Samuel ... McLean, Thomas
- McLean, William L. ... McPherson, Newton Leroy
- McPherson, Rolf K. ... meadow mouse
- Meadow of Flowers ... Measurement of Intelligence, The
- Measurement of the Circle ... mechanical watch
- mechanical weathering ... Medelpad
- Medenine ... medical waste
- Medical Women’s National Association ... Medina, Constitution of
- Medina, Danilo ... Medobory-Toltry ridge
- Médoc ... Mega-Chad
- mega-dune ... megaton
- Megaupload ... Mei
- Mei Chüeh-ch’eng ... Meissen
- Meissen ... Melanesian Pidgin English
- Melanesian pidgins ... Melen, Ferit
- Melencolia I ... Melnyk, Andry
- Melo ... Melzack, Ronald
- Melzi d’Eril, Francesco ... Memoirs of Fanny Hill
- Memoirs of Glückel of Hameln, The ... Memphremagog, Lake
- memristor ... Mendel, Gregor Johann
- Mendel, Johann ... ménestrel
- Ménéstrier, Claude-François ... Meno
- Menocal, Mario García ... Mentha spicata
- Menthe, Ferdinand Joseph La ... Mercara
- Mercat Cross ... mercuric sulfide
- Mercurio galante, El ... merganser
- Merge ... Merlin
- Merlin ... Merriman, Robert Hale
- Merritt Island National Wildlife Refuge ... mesa
- Mesa Arizona Temple ... Mesocricetus raddei
- mesocyclone ... Messali Hadj, Ahmed
- Messalian ... Met Cloisters, the
- Met Gala ... metallocene
- metalloenzyme ... Metastrongyloidea
- Metastrongylus ... metformin
- Metge, Bernardo ... methyl hydrazine
- methyl isocyanate ... metropolis
- Metropolis ... Mexican abelia
- Mexican agouti ... Meydān-e Shāh
- Meyer, Adolf ... MG1
- MG2 ... Miastor
- MIBG ... Michel, Robert
- Michel, Robert Henry ... micro topography
- micro-tidal coast ... microfinance
- microfluidic system ... microsleep
- Microsoft Corporation ... mid-oceanic ridge system
- mid-oceanic rift ... Middle Permian Series
- Middle Persian language ... Midland
- Midland ... Między wojnami
- Miege disease ... Migration Act 1966
- Migration of the American Negro, The ... Mikrophonie I
- Mikroscopische Beschaffenheit der Mineralien und Gesteine ... Miles, Nelson A.
- Miles, Otis ... Military Park
- military pentathlon ... Millbrook
- Millburn ... Miller, Lee
- Miller, Maria ... millisievert
- millón de muertos, Un ... Miltown
- Milutin ... Min River
- Min Shan ... Mindanao
- Mindanao Deep ... minesweeper
- minesweeping boat ... minimal art
- minimal brain dysfunction ... Minner, Ruth Ann
- Minnesang ... Minot, George Richards
- Minot, Laurence ... Mīr Bozorg, mausoleum of
- Mīr Dāmād ... Miranda
- Miranda ... mirror writing
- Mirror, Mirror ... Mishkan
- Mishkāt al-anwār ... Missa Malheur me bat
- Missa nos autem gloriari ... Mississippi Embayment
- Mississippi Flyway ... Mistry, Cyrus
- Mistry, Cyrus Pallonji ... Mithradates II
- Mithradates III ... Mitsui Mining Company, Ltd.
- Mitsui Mutual Life Insurance Company ... Mixolydian mode
- mixotroph ... mlenmlen
- MLF ... Moabite alphabet
- Moabite language ... Mocha Dick
- Mocha Island degu ... modello
- modem ... Modernism
- Modernism ... Moen
- Moen, John ... Moḥammad Shāh
- Moḥammad Shams al-Dīn Ḥāfiz ... Moissan, Henri
- moist adiabatic lapse rate ... Moldova, history of
- Moldova, Republic of ... Molina, Pedro
- Molina, Tirso de ... molybdenum
- molybdenum disilicide ... Monáe, Janelle
- Monagas ... Mondriaan, Pieter Cornelis
- Mondrian, Piet ... Mongolian invasion
- Mongolian language ... Monkey Wrench Gang, The
- Monkey’s Paw, The ... Monodon monoceros
- Monodontidae ... monounsaturated fatty acid
- monovalence ... Monster House
- Monster of Florence ... Montana Arts Council
- Montaña de Covadonga National Park ... Montenegro, Fernanda
- Montenegro, flag of ... Montgomery, Richard
- Montgomery, Robert ... Monts, Pierre du Gua, sieur de
- Montsagrat ... Moon is Down, The
- Moon Is Down, The ... Moore’s Landing
- Moore’s law ... Moosehead Lake
- Moosonee ... moran
- Moran Hill ... More, Anthony
- More, Hannah ... Morgan, Alexandra Patricia
- Morgan, Ann ... Mörike, Eduard Friedrich
- Morillo, Pablo ... Morning Phase
- Morning Show, The ... Morquio syndrome
- Morquio-Brailsford disease ... Morrison, Robert
- Morrison, Scott ... Mortimer, Penelope
- Mortimer, Penelope Ruth ... Moschidae
- Moschiola ... Mosey, Phoebe Anne
- MOSFET ... Mossoró
- mossy-cup oak ... Mother Tantra
- Mother Teresa ... Motley, John Lothrop
- Motley, Marion ... Mottke, the Thief
- Mottl, Felix ... Mount Holyoke College
- Mount Holyoke Female Seminary ... Mountain Interval
- mountain laurel ... Mousa
- Mousa ... Movement of Democratic Forces of Casamance
- Movement of Popular Participation ... moyen âge, le
- Moyen Atlas ... Mpi language
- MPLA ... Mr. Saturday Night
- Mr. Shome ... MSL
- MSM ... Mucianus, Gaius Licinius
- mucilage ... mudrock
- Mudrooroo ... Muḥammad al-Khalīlī
- Muḥammad al-Mahdī al-Ḥujjah ... Muhan
- Muhando, Penina O. ... Mukhlas
- Mukhran, house of ... mullein
- Mullen test ... multichip integrated circuit
- multicollinearity ... multiple-resistant Staphylococcus aureus
- multiple-station machine ... Mun
- Mun River ... Munich
- Munich 1972 Olympic Games ... Muntiacus feae
- Muntiacus putaoensis ... Murano Tōgo
- murāqabah ... murex
- Murex brandaris ... Murphy, WIlliam Parry
- Murphy-O’Connor, Cormac ... Mursil I
- Mursilis I ... muscarine
- muscarinic receptor ... museography
- museology ... Music in Cuba
- Music in Shakespeare’s Plays ... musique concrète
- Musique de table ... mustache
- mustache shrimp ... Mutationstheorie, Die
- Mutawakkil, al- ... Muẓaffar Jang
- Muẓaffar Sayf ad-Dīn Quṭuz, al- ... My Bloody Valentine
- My Blue Heaven ... My Life, Starring Dara Falcon
- My Lifetime in Letters ... mycetocyte
- mycetoma ... Myittha River
- Mykerinos ... MyPyramid
- Myra ... Mystère de la Passion
- Mystère Picasso, Le ... Mytilus edulis
- Mytilus exustus ... Mʾzabite
