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O'Brian, Patrick O'Brien (as used in expressions) O'Brien, Flann O'Brien, Lawrence O'Brien, William Smith O'Casey, Sean O'Connell, Daniel O'Connor (as used in expressions) O'Connor, (Mary) Flannery O'Connor, Feargus Edward O'Connor, Frank O'Connor, Sandra Day O'Faolain, Sean O'Flaherty, Liam O'Hara, John (Henry) O'Higgins, Bernardo O'Keeffe, Georgia O'Mahony, John O'Neill (as used in expressions) O'Neill, Eugene (Gladstone) O'Neill, John O'Sullivan, Timothy H. O'Toole, Peter (Seamus) Oahu oak oak (as used in expressions) Oakland Oakley, Annie oasis Oates, Joyce Carol Oates, Titus Oath (as used in expressions) oats Oaxaca Oaxaca (as used in expressions) Ob River Obadiah obelisk Oberlin College obesity obia object (as used in expressions) object-oriented programming (OOP) oblation oboe Obote, (Apollo) Milton Obraztsov, Sergey Vladimirovich Obrecht, Jakob Obregon, alvaro obscenity observatory observatory (as used in expressions) obsessive-compulsive disorder obsidian obstetrics and gynecology Obuchi, Keizo occasionalism Occitan language occultism Occupation (of Japan) occupational (as used in expressions) occupational disease occupational therapy ocean ocean (as used in expressions) ocean current ocean liner Oceania oceanic (as used in expressions) Oceanic arts oceanic plateau Oceanic religions oceanic ridge oceanography Oceanside ocelot Ochoa, Ellen Ochoa, Severo Ochs, Adolph Simon Ockeghem, Johannes Ockham's razor Ockham, William of Ocoee River OCR October Manifesto octopus oculus Oda Nobunaga ode Odense Oder River Oder-Neisse Line Odessa Odets, Clifford odeum Odin Odo of Bayeux Odoacer Odum, Howard W(ashington) Odysseus Odysseus (as used in expressions) Oedipus Oedipus complex Oerter, Al(fred) Off-Broadway Offa Offa's Dyke Offenbach, Jacques Office (as used in expressions) Office of Strategic Services (OSS) offset (as used in expressions) offset printing Ogaden Ogata Kenzan Ogbomosho ogham writing Ogilvy, David M(ackenzie) Oglethorpe, James (Edward) Ogooue River Ohio Ohio (as used in expressions) Ohio Co. Ohio Idea Ohio River Ohio State University Ohm's law Ohm, Georg Simon oil oil (as used in expressions) oil painting oil seal oil shale Oise River Oistrakh, David (Fyodorovich) Ojibwa Ojukwu, Odumegwu Oka River okapi Okavango River OKB (as used in expressions) Okeechobee, Lake Okefenokee Swamp Okhotsk, Sea of Okinawa Oklahoma Oklahoma City okra Oktoberfest Okumura Masanobu Olaf (as used in expressions) Olaf I Tryggvason Olaf II Haraldsson Olaf V Olajuwon, Hakeem (Abdul) Olbers's paradox Olbia Old (as used in expressions) Old Believers Old Catholic church Old Church Slavonic language Old English Old English sheepdog Old Norse language Old Point Comfort Old Testament Old Vic Old World monkey Oldenbarnevelt, Johan van Oldenburg Oldenburg, Claes (Thure) Oldowan industry Olduvai Gorge Ole (as used in expressions) oleander oleaster family olefin Olga (as used in expressions) Olga, Saint oligarchy Oligocene Epoch oligopoly oligosaccharide olive Oliver (as used in expressions) Oliver, King Olives, Mount of Olivetti & C. SpA Olivier, Laurence (Kerr), Baron Olivier (of Brighton) olivine Olmec Olmsted, Frederick Law Olmutz, Punctation of Olney, Richard Olt River Olympia Olympic (as used in expressions) Olympic Games Olympic Mountains Olympic National Park Olympus Mons Olympus, Mount Olynthus om Omagh Omaha Oman Oman (as used in expressions) Oman, Gulf of Omar (as used in expressions) Omar Khayyam ombudsman Omdurman Omega Centauri omen Ometecuhtli omnivore Omsk Onassis, Aristotle (Socrates) Onassis, Jacqueline Kennedy oncogene Ondaatje, (Philip) Michael Onega, Lake Oneida Oneida Community onion only (as used in expressions) Onsager, Lars Ontario Ontario, Lake ontological argument ontology onychophoran onyx Oort cloud Op art opal OPEC open (as used in expressions) open cluster Open Door policy open market operation open-heart surgery open-hearth process opera opera (as used in expressions) operating system (OS) operationalism operations (as used in expressions) operations research operetta operon Opet Ophite ophthalmology Ophuls, Max Opie, Eugene Lindsay opium opium poppy Opium Wars opossum Oppenheimer, J(ulius) Robert opportunity cost opposition, square of optical (as used in expressions) optical activity optics Optimates and Populares optimization optometry opuntia Opus Dei oracle oral (as used in expressions) oral tradition Oran orange orange (as used in expressions) Orange Free State Orange River Orange, house of orangutan Oranjestad oratorio Orbison, Roy orbital Orcagna, Andrea orchestra orchestration orchid orchitis Orchomenus Orczy, Emmuska (Magdalena Rosalia Marie Josepha Barbara), Baroness Ord River ordeal order order (as used in expressions) order in council ordinary differential equation Ordovician Period Ordzhonikidze, Grigory (Konstantinovich) ore ore (as used in expressions) oregano Oregon Oregon (as used in expressions) Oregon Caves National Monument Oregon Question Oregon Trail Orestes Orff, Carl organ organ (as used in expressions) Organ Pipe Cactus National Monument organic (as used in expressions) organic compound organic farming Organization (as used in expressions) Organization of African Unity (OAU) Organization of American States (OAS) organizational (as used in expressions) organized crime organum Orhon River oriel Orient Express orientation orienteering Origen original sin Orinoco River oriole Orion Orion Nebula Orissa Orkney Islands Orlando Orlando (as used in expressions) Orlando, Vittorio Emanuele Orleans Orleans, house of Orleans, Louis-Philippe-Joseph, duke d' Orlov, Aleksey (Grigoryevich), Count Orlov, Grigory (Grigoryevich), Count Ormandy, Eugene ormolu Ormonde, James Butler, 12th earl and 1st duke of ornamentation Orne River ornithischian ornithology Oro (as used in expressions) orogeny orogeny (as used in expressions) Oromo Orontes River Orozco, Jose Clemente Orpheus Orphism Orr, Bobby Ortega (Saavedra), (Jose) Daniel Ortega y Gasset, Jose orthoclase Orthodox (as used in expressions) Orthodox Judaism orthogonal polynomials orthogonality orthopedics Orton, Joe Orville (as used in expressions) Orwell, George oryx Osage Osage River Osborne (as used in expressions) Osborne, John (James) Oscan language Oscar (as used in expressions) Osceola oscillator oscilloscope Oshogbo Osiris Oskar (as used in expressions) Osler, Sir William Oslo osmosis osprey Osservatore Romano, L' Ossian Ossianic ballads Ossory Ostade, Adriaen van Ostend Manifesto osteoarthritis osteogenesis imperfecta osteopathy osteoporosis Ostia ostomy Ostpolitik Ostrava ostrich Ostrogoth Ostrovsky, Aleksandr (Nikolayevich) Ostwald, (Friedrich) Wilhelm Oswald (as used in expressions) Oswald, Lee Harvey other minds, problem of Otis (as used in expressions) Otis, Harrison Gray Otis, James otitis otolaryngology Otomanguean languages Otomi ottava rima Ottawa Ottawa River otter Otto (as used in expressions) Otto I Otto III Otto IV Otto, Nikolaus August Otto, Rudolf Ottoman Empire Ottonian art Otway, Thomas Ouachita River Ouagadougou Oudh Oudry, Jean-Baptiste Ouida Ouija board ounce Ouse, River Outer Banks outwash Ouyang Xiu ouzel ovarian cancer ovary over-the-counter market overpopulation overtone overture Ovett, Steve Ovid Oviedo Ovimbundu Owen (as used in expressions) Owen, Robert Owen, Robert Dale Owen, Wilfred Owens, Jesse owl owl (as used in expressions) ox oxalic acid oxalis oxbow lake oxeye daisy Oxford Oxford (as used in expressions) Oxford English Dictionary, The (OED) Oxford movement Oxford, Edward de Vere, 17th earl of Oxford, Provisions of Oxford, University of Oxfordshire oxidation-reduction oxide oxide (as used in expressions) oxide mineral oxygen Oxyrhynchus Oyo empire oyster oystercatcher Oz, Amos Ozark Mountains Ozarks, Lake of the Ozawa, Seiji Ozick, Cynthia Ozma, Project ozone ozone layer Ozu Yasujiro