- Mörike, Eduard
- Mörikofer, Johann Kaspar
- Moritz, Karl Philipp
- Mormon Cricket
- Mormons
- Mosque
- Most, Johann Joseph
- Mountain Climbing
- Mountain Meadows Massacre
- Mud-Wasp
- Muezzin
- Mufti
- Mügge, Theodor
- Mugger
- Muggletonians
- Mugwort
- Mugwump
- Muharram
- Mühlbach, Luise
- Mühlberg
- Mühleisen-Arnold, John
- Muhlenberg, Frederick Augustus Conrad
- Muhlenberg, Gotthilf Heinrich Ernst
- Muhlenberg, Heinrich Melchior
- Muhlenberg, John Peter Gabriel
- Muhlenberg, William Augustus
- Muhlenberg College
- Muir, John (naturalist)
- Mullein
- Müllenhoff, Karl Viktor
- Müller
- Müller, Andreas
- Müller, August
- Müller, Charles Louis
- Müller, David Heinrich
- Müller, Eduard
- Müller, Ferdinand von
- Müller, Friedrich (poet)
- Müller, Friedrich (engraver)
- Müller, Friedrich (philologist)
- Müller, Friedrich von
- Müller, Friedrich Max
- Müller, Georg Elias
- Müller, Georg Friedrich
- Müller, Gerhard Friedrich
- Müller, Ivan von
- Müller, Johann Friedrich Theodor
- Müller, Johann Gotthard von
- Müller, Johannes (Regiomontanus)
- Müller, Johannes
- Müller, Johannes von
- Müller, Julius
- Müller, Karl Otfried
- Müller, Leopold
- Müller, Lucian
- Müller, Max
- Müller, Morten
- Müller, Otho Friederik
- Müller, Otto
- Müller, Peter Erasmus
- Müller, Victor
- Müller, Wenzel
- Müller, Wilhelm
- Muller, William John
- Müller, Wolfgang
- Müller-Guttenbrunn, Adam
- Mullet (fish)
- Mullet (heraldry)
- Mulligan Letters
- Mullingar
- Mundt, Klara
- Mundt, Theodor
- Municipal Government
- Munsee
- Munsell, Joel
- Munson, James Eugene
- Münster
- Munster
- Münster, Sebastian
- Münsterberg, Hugo
- Munthe, Ludvig
- Muntjac
- Müntz, Charles Achille
- Müntz, Eugène
- Münzer, Thomas
- Munzinger, Werner
- Murray, Alexander Stuart
- Murray, David
- Murray, David Christie
- Murray, George
- Murray, George Henry
- Murray, Grenville
- Murray, Hugh
- Murray, James
- Musk Ox
- Musk Plant
- …
- Mutiny
- Mutiny Act
- Mutsuhito
- Mutton-bird
- Mutton-fish
- Muttra
- Mutualism
- Mutule
- …
- Narbada
- Narragansett Bay
- Narragansett Pier
- Narrenschiff, Das
- Narses
- Narthex
- Naruszewicz, Adam Stanislaw
- Nash, John
- Nash, Joseph
- Nash, Richard
- Nash, Thomas
- Nashua
- Nashville (Illinois)
- Nashville (Tennessee)
- Natal (Brazil)
- Natalie
- Natant
- Natchez (tribe)
- Natchez (city)
- Natchez, Les
- Natchitoches (tribe)
- Natchitoches (Louisiana)
- Nathanael
- Nathan der Weise
- Nature Printing
- Nature-study
- Navesink Highlands
- Navez, François
- Navicular Disease
- Navies
- Navigable River
- Navigators' Islands
- Naville, Edouard Henri
- Navy, Department of the
- Navy Register
- Navy Yard
- Nawanagar
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- Neanderthal Man
- Neapolis (Macedonia)
- Neapolis (Naples)
- Neap-Tides
- Nearchus
- Nearctic Region
- Near-Sightedness
- Neath
- Nebenius, Karl Friedrich
- Nebo
- Nebo, Mount
- Nebraska
- Nebraska (river)
- Nebraska, University of
- Nebraska City
- Nebuchadnezzar
- Nebula
- Nebulæ
- Nebular Hypothesis
- Nebuly
- Necessaries
- Neches
- Necho
- Negro Exodus
- Negro in America
- Negro Melodies
- Negro Monkey
- Neptune (mythology)
- Neptune (planet)
- Neptune, Temple of
- Neptunian
- Nérac
- Nerbudda
- Nereid Monument
- Nereids
- Nereis
- Nereites
- Nereus
- Nergal
- Neri, Philip
- Nerinea
- Nerissa
- Nerium
- Nerly, Friedrich
- Nernst, Walther
- Nernst Lamp
- Nero
- Nertchinsk
- Nerthus
- Néruda, Jan
- Neruda, Wilma Maria Francisca
- Nerva, Forum of
- Nerva, Marcus Cocceius
- Neuwied
- Neva
- Nevada
- Nevada (Iowa)
- Nevada (Missouri)
- Nevada, Emma
- Nevada City
- Nevada State University
- Névé
- Nevers
- Neversink Highlands
- Nevianskii-Zavod
- Newark (Nottinghamshire)
- Newark (Delaware)
- Newark (New Jersey)
- Newark (New York)
- Newark (Ohio)
- Newark Series
- New Atlantis, The
- Newaygo
- New Bedford
- Newbern
- Newberry
- Newberry, John Strong
- Newbery, John
- New Brunswick (New Jersey)
- Newburgh
- Newburgh Addresses
- Newburn
- Newbury
- Newhall, Charles Stedman
- New Hampshire
- New Hanover
- New Harmony
- Newhaven
- New Haven
- New Hebrides
- New Holland
- New Iberia
- New Inn Hall
- New Ireland
- New Jersey
- New Jersey, College of
- New Jersey Tea
- New Jerusalem Church
- Newmarket (England)
- Newmarket (Canada)
- New Mecklenburg
- New Mexico
- New Mexico, University of
- New Mexico College . . .
- New Milford
- New Model, The
- Newnan
- New Netherland
- Newnham College
- New Orleans
- New Orleans, Battle of
- New Philadelphia
- New Philippines
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- New Pomerania
- Newport
- Newport (Isle of Wight)
- Newport (Kentucky)
- Newport (New Hampshire)
- Newport (Rhode Island)
- Newport (Vermont)
- Newport, Christopher
- Newport, George
- Newport News
- New Providence
- New Red Sandstone
- New River
- Newspaper
- New Sweden
- New Testament Chronology
- New Ulm
- New Way to Pay Old Debts, A
- New Westminster
- New Year's Day
- New York (State)
- New York (city)
- New York, College of the City of
- New York Academy of Sciences, The
- New York Bat
- New York Historical Society
- New York Public Library
- New York University
- New York Weasel
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- Nice, Councils of
- Nicene Creed, the
- Nicephorus
- Nicephorus I.
- Nicephorus II.
- Nicephorus III.
- Nicolay, John George
- Nictheroy
- Nicum, John
- Nidification
- Niebuhr, Barthold Georg
- Niebuhr, Carsten
- Niecks, Frederick
- Nihilism
- Nihongi
- Niigata
- Ninde, William Xavier
- Nindemann, Wilhelm Friedrich Carl
- Ninigret
- Niño, Pedro Alonso
- Ninon de l'Enclos
- Niobe
- Noble, John Willock
- Noma
- Nomad
- Nomada
- No Man's Land
- Nomarchy
- Nome (Egypt)
- Nome (melody)
- Nome (Alaska)
- Nome, Cape
- Nomenclature, Scientific
- Nominalism
- Nomination
- Nominative Case
- Nordhoff, Charles
- Nordica, Lillian
- Noreen, Adolf Gotthard
- Normandy
- Norman French
- Norman Law
- Normann, Eilert Adelsten
- Normans
- North Braddock
- Northbridge
- Northbrook, Earl
- North Cape
- North Carolina
- North Carolina, University of
- North Conway
- Northcote, James
- Northcote, Stafford Henry
- North Dakota
- North Dakota, University of
- North Downs
- Northeast Boundary Dispute
- Northeast Cape
- Northeast Passage
- Northen, Adolf
- Norther
- Northern Lights
- Northern Territory
- Northwestern University
- Northwest Territory
- Norwalk (Connecticut)
- Norwalk (Ohio)
- Norway
- Norwegian Language
- Norwegian Literature
- Novalis
- Nurse-shark
- Nus, Eugène
- Nusku
- Nusle
- Nussbaum, Johann Nepomuk
- Nut
- Nût
- Nutation (astronomy)
- Nutation (in plants)
- Nut-brown Maid, The
- Nut-cracker
- Nutgall
- Nut Grass
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- Ockeghem
- Ockenheim
- O’Curry, Eugene
- Ocydrome
- Odal
- Odd Fellows, Independent Order of
- Ode
- Odell, Benjamin B.
- Odell, Jonathan
- Odenathus
- Ödenburg
- Odenheimer, William Henry
- Odenkirchen
- Odense
- Odenwald
- Odéon
- Oder
- Odessa
- Odeum
- Odin
- Odo of Bayeux
- Odo of Paris
- Odoacer
- Odometer
- Odonata
- O’Donnell, Leopold
- O’Donoghue, David J.
- Odovacer
- Oehlenschläger, Adam Gottlob
- Oehler, Gustav Friedrich
- Oehme, Erwin
- Oesar
- Oeser, Adam Friedrich
- Oesterley, Karl Wilhelm
- Oetinger, Friedrich Christoph
- Oettingen, Alexander von
- Ogden
- Ogyges
- Ogygia
- O'Hagan, Thomas
- O'Hara, Theodore
- O'Higgins
- O'Higgins, Ambrosio
- O'Higgins, Bernardo
- Ohio
- Ohio Company
- Ohio River
- Ohio State Archæological and Historical Society
- Ohio State University
- Ohio University
- Ohio Wesleyan University
- Ohlau
- Ohligs
- Ohm
- Ohm, Georg Simon
- Ohm's Law
- Ohnet, Georges
- Oidium
- Oil-beetle
- Oil-bird
- Oil-cake
- Oil City
- Oilcloth
- Oil-fish
- Oillet
- Oil Palm
- Oil Rivers
- Oils
- Oil Sand
- Oil Shark
- Oil-stone
- Oil Wells
- Ointment
- Oise (department)
- Oise (river)
- Ojeda, Alonso de
- Ojibwa
- O. K.
- Oka (river)
- Oka (village)
- Okapi
- Okavango
- Okayama
- Okeechobee
- O’Keefe, John
- Okefinokee Swamp
- Okeghem
- Okekem
- O’Kelly, Charles
- O’Kelly, James
- Oken, Lorenz
- Okhotsk, Sea of
- Okinagan
- Okinawa
- Oklahoma
- Oklahoma, University of
- Oklahoma City
- Okra
- Okubo, Toshimichi
- Okuma, Shigenobu
- Olaf I. Trygvasson
- Olaf II.
- Öland
- Olathe
- Oldcastle, John
- Old Catholics
- Öls
- Olshausen, Hermann
- Olshausen, Justus
- Olshausen, Robert
- Olshausen, Theodor
- Ölsnitz
- Olsson, Olof
- Omaha (tribe)
- Omaha (city)
- O'Mahony, John Francis
- Omalius d'Halloy, Baron d'
- O'Malley, Charles
- O'Malley, Grace
- O'Malley, Thadeus
- Omer Pasha
- Om Mani Padme Hum
- Ommiads
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