O
Oahe Dam Oahu oak
Oak Creek Oak Forest Oakland Oak
Lawn Oakley,
Annie Oak Park
Oak Ridge Oakville oasis
Oates, Joyce Carol
Oates, Titus
oath oats Oaxaca,
state, Mexico Oaxaca,
city, Mexico Ob
Obadiah, persons
in the Bible Obadiah,
book of the Bible Obaidallah
Obal Oban Obasanjo,
Olusegun obbligato
Obdorsk Obed Obed-edom
Obed Wild and
Scenic River Obeid,
El obelisk
Oberalp Oberammergau Oberhausen Oberholtzer, Ellis Paxson Oberland, Bernese Oberlin, Jean Frederic Oberlin College Oberon obesity
Obil object-oriented programming oblast obliquity
of the ecliptic oboe
Obote, Apollo Milton
Obrecht, Jacob
Obregon, Alvaro
Obrenovic Obrenovich O'Brien, Conor Cruise O'Brien, Edna O'Brien, Flann O'Brien, William O'Brien, William Smith obscenity observatory
observatory, orbiting
obsidian obstetrics Obuasi Obuchi,
Keizo Obwalden
Ocala ocarina O'Casey,
Sean Occam,
William of occasionalism
Occitan Occleve, Thomas Occom, Samson occultation occultism occupational
disease Occupational
Safety and Health Administration ocean
Ocean City
Oceania Oceanic art Oceanic languages oceanids Ocean Island oceanography ocean perch Oceanside Oceanus
ocellus ocelot Ochakov
ocher Ochino, Bernardino Ochoa, Severo Ocho Rios Ochrida
Ochs, Adolph S.
Ockeghem, Johannes
Ockham, William
of Ocmulgee
Ocmulgee National
Monument Oconee
O'Connell, Daniel
O'Connor, Feargus
O'Connor, Flannery
O'Connor, Frank
O'Connor, John Joseph
O'Connor, Rory
O'Connor, Sandra
Day O'Connor,
Thomas Power octahedron
octane number
octave Octavia Octavian
October October Revolution octopus Oda
Nobunaga Odda
ode Oded Odenathus,
Septimius Odenburg
Odense Odenwald Oder
Oder-Neisse line
Odessa, city, Ukraine
Odessa, city, United
States Odets,
Clifford Odin
Odo Odoacer odometer
O'Donnell, Hugh
Roe O'Donnell,
Leopoldo O'Donoju,
Juan Odovacar
Odra Odria, Manuel Odum, Howard Washington Odysseus Odyssey
Oe, Kenzaburo
OECD Oecolampadius, Johannes Oedipus Oedipus
complex Oehlenschlager,
Adam Gottlob Oeneus
Oenone Oenothera Oersted, Hans Christian Oeta O'Faolain,
Sean Ofen,
German name for Buda, Hungary Ofen,
Alpine pass, Switzerland Offa
Offaly Offa's Dyke Offenbach, Jacques Levy Offenbach am Main offertory Office
of Price Administration Office
of Strategic Services Office
of War Information Offner,
Richard offset
Offutt Air Force
Base O'Flaherty,
Liam Og Ogaden Ogasawara-gunto
Ogata Kenzan
Ogata Korin
Ogbomosho Ogden, city, United States Ogden, river, United States Ogdensburg Oge, Vincent ogham Ogier
the Dane Oglala
Sioux Oglesby,
Richard James Oglethorpe,
James Edward Ogoki
Ogooue O'Gorman, Juan Ogowe OGPU
O'Grady, Standish
O'Grady, Standish
Hayes Ogyges
Ogygia Oh, Sadaharu Ohad
O'Hara, Frank
O'Hara, John
Ohel O. Henry O'Higgins,
Ambrosio O'Higgins,
Bernardo Ohio,
state, United States Ohio,
river, United States Ohio
and Erie Canal Ohio
Company Ohio
Company of Associates Ohio
State University Ohio
University Ohira,
Masayoshi Ohlin,
Bertil Ohm,
Georg Simon ohm
ohmmeter Ohm's law Ohrid
Ohrid, Lake
Ohthere oil beetle oilbird Oil
City oilcloth
oil gas oil industry oil of bitter almond oil of vitriol oil of wintergreen oils oil
spill oilstone
Oirat Autonomous
Oblast Oise, department,
France Oise,
river, Belgium and France Oisin
Oistrakh, David
Feodorovich Oita
Ojeda, Alonso de
Ojibwa Ojos del Salado Ojukwu, Chukwuemeka Odumegwu Oka, village, Canada Oka, river, central European Russia
Oka, river, Siberian
Russia Okada,
Keisuke Okanagan
Lake Okanogan
okapi Okara Okavango
Okayama Okeechobee, Lake Okeechobee Waterway O'Keeffe, Georgia Okefenokee Swamp Okeghem, Jean d' Okhotsk, Sea of Okhrida Okinawa
Oklahoma Oklahoma, University of Oklahoma City Oklahoma State University Okmulgee okra
Okubo, Toshimichi
Okuma, Shigenobu
Olaf I Olaf II Olaf
V Olaf Guthfrithson
Olajuwon, Hakeem
Oland Olathe Olbers,
Heinrich Wilhelm Matthaus Olbia
Olcott, Henry Steel
old age old-age pension Old Castile Oldcastle, Sir John Old Catholics Old Church Slavonic Oldenbarneveldt, Johan van Oldenburg, Claes Oldenburg, former state, Germany
Oldenburg, city,
Germany Old
English old
English sheepdog Old
Faithful Oldfield,
Anne Oldham,
John, colonist in New England Oldham,
John, English poet and satirist Oldham
Old Hundredth
Old Ironsides
Old Lyme Oldman Old
Man of the Mountain, in Islamic history Old
Man of the Mountain, rock formation, United States old-man's-beard Old Norse literature Old Northwest Old Orchard Beach Old Pretender Old Red Sandstone Olds Old
Sarum Old
Stone Age Old
Style dates Old
Testament Olduvai
Gorge Old Vic
Olean oleander oleaster olefin
Oleg Olekma Olenek
oleomargarine
Oleron Olesha, Yuri oleum oligarchy
Oligocene epoch
oligopoly
oligosaccharide
Olimbos Olinda Oliphant,
Laurence Oliphant,
Margaret Oliphant (Wilson) Olisipo
Olitski, Jules
Oliva, Peace of
Olivares, Gaspar
de Guzman, conde-duque de olive
olive oil Oliver, Andrew Oliver, Isaac Oliver, King Olives, Mount of Olivier, Isaac Olivier, Laurence Kerr, Baron Olivier
of Brighton Olivier,
Sydney Haldane Olivier, 1st Baron olivine
Ollivant, Alfred
Ollivier, Emile
olm Olmec Olmedo,
Jose Joaquin Olmsted,
Frederick Law Olmutz
Olney, Jesse
Olney, Richard
Olomouc Olonos, Mount Olson, Charles Olson, Floyd Bjornstjerne Olsztyn Olten
Oltenia Olympia, city, United States Olympia, city, ancient Greece Olympiad Olympian
Olympias Olympic elk Olympic games Olympic Mountains Olympio, Sylvanus Olympus Olympus,
Mount Olynthus
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