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Encyclopedia: Ori - Oz
- Oribe, Manuel
- Oribi
- Oriel
- Orientale
- Orientation
- Origen
- Original Sin
- Orillia
- Orinoco
- Oriole
- Orion
- Orion
- Orion Nebula
- Orissa
- Oriya
- Orizaba
- Orizaba
- Orkhan
- Orkhon
- Orkney Islands
- Orlando
- Orlando, Vittorio Emanuele
- Orlando
- Orléanais
- Orléans
- Orléans, Charles, Duc D'
- Orléans, Gaston, Duc D'
- Orléans, Henrietta Anne, Duchesse D'
- Orléans, Henri Philippe Marie, Prince D'
- Orléans, Louis, Duc D'
- Orléans, Louis Philippe Joseph, Duc D'
- Orléans
- Orléans, île D'
- Orley, Bernard Van
- Orlon
- Orlov, Aleksey Grigoryevich, Count
- Orlov, Grigori Grigoryevich, Count
- Orly
- Ormandy, Eugene
- Ormazd
- Ormerod, Eleanor Anne
- Ormolu
- Ormond Beach
- Ormonde, James Butler, 12th earl And 1st duke Of
- Ormonde, James Butler, 2d duke Of
- Ormonde, James Butler, 5th earl Of
- Ormonde, Thomas Butler, 10th earl Of
- Ormskirk
- Ormulum
- Ormuz
- Ormuzd
- Ornament
- Ornament
- Ornan
- Orne
- Ornithopter
- Oromo
- Oromocto
- Oronsay
- Orontes
- Orosius, Paulus
- Oroville Dam
- Orozco, José Clemente
- Orpah
- Orpen, Sir William
- Orphan
- Orphan Drug
- Orphan Trains
- Orpheus
- Orphic Mysteries
- Orphism
- Orpine
- Orr, Bobby
- Orr, James Lawrence
- Orrefors
- Orrery, Charles Boyle, 4th earl Of
- Orrery, Roger Boyle, 1st earl Of
- Orrisroot
- Orrmulum
- Orrum, Eilley
- Ors, Eugenio D'
- Orsay, Alfred Guillaume Gabriel, Count D'
- Orsha
- Orsini
- Orsini, Felice
- Orsk
- Ortega Saavedra, Daniel
- Ortega Y Gasset, José
- Ortelius, Abraham
- Orthoclase Feldspar
- Orthodontics
- Orthodox Eastern Church
- Orthopedics
- Ortles
- Orton, Joe
- Ortona
- Ortygia
- Oruro
- Orvieto
- Orwell, George
- Oryx
- Os
- Osage
- Osage
- Osage Orange
- Osaka
- O Salutaris Hostia
- Osama Bin Laden
- Osawatomie
- Osborn, Henry Fairfield
- Osborne, Dorothy
- Osborne, John
- Osborne, Thomas Burr
- Osborne, Thomas Mott
- Osborne House
- Oscan
- Oscar I
- Oscar Ii
- Osceola
- Oscillator, Electronic
- Oscilloscope
- Osee
- ösel
- Osgood, Herbert Levi
- Osh
- O'shaughnessy, Arthur William Edgar
- Oshawa
- Oshea
- O-shima
- Oshkosh
- Oshogbo
- Osiander, Andreas
- Osier
- Osijek
- Osipenko
- Osiris
- Oskaloosa
- Oskarshamn
- öskemen
- Osler, Sir William
- Oslo
- Osman
- Osman I
- Osman Nuri Pasha
- Osmeña, Sergio
- Osmium
- Osmosis
- Osnabrück
- Osnappar
- Osorio, Oscar
- Osorno
- Osprey
- Osroene
- Oss
- Ossa
- Ossetia
- Ossetian Military Road
- Ossian
- Ossietzky, Carl Von
- Ossining
- Ossoli, Marchesa
- Ossory, Thomas Butler, Earl Of
- Ossory
- Ostade, Adriaen Van
- Ostend
- Ostend Manifesto
- Osteomyelitis
- Osteopathy
- Osteoporosis
- Osterman, Andrei Ivanovich, Count
- östersund
- østfold
- Ostia
- Ostinato
- Ostracism
- Ostrava
- Ostrich
- Ostrogoths
- Ostrołęka
- Ostrovsky, Aleksandr Nikolayevich
- Ostwald, Wilhelm
- O'sullivan, Timothy H.
- O'sullivan Dam
- Osuna, Pedro Téllez Girón, Duque De
- Oswald, Saint
- Oswald, Lee Harvey
- Oswego
- Oswego
- Oswego Tea
- Oswestry
- Oświęcim
- Oswy
- Otaru
- Otfried Von Weissenburg
- Othman
- Othman I
- Othniel
- Otho
- Otho, Marcus Salvius
- Otis, Bass
- Otis, Elisha Graves
- Otis, Harrison Gray
- Otis, Harrison Gray
- Otis, James
- Oto
- Otomí
- Otosclerosis
- Otranto
- Otsego Lake
- Otsu
- Ottava Rima
- Ottawa
- Ottawa
- Ottawa
- Ottawa
- Ottawa, University Of
- Otter
- Otter, Peaks Of
- Otterbein, Philip William
- Otterburn
- Otterhound
- Otto I
- Otto Ii
- Otto Iii
- Otto Iv
- Otto I
- Otto I
- Otto
- Otto, Frei
- Otto, Nikolaus August
- Ottocar I
- Ottocar Ii
- Ottoman Empire
- Ottonian Art
- Otto Of Freising
- Otto The Great
- Ottumwa
- Otus
- Otway, Thomas
- ötztal Alps
- Ouabain
- Ouachita
- Ouachita Mountains
- Ouagadougou
- Ouakari
- Ouargla
- Ouchy
- Oud, Jacobus Johannes Pieter
- Oudenaarde
- Oudh
- Oudh
- Oudinot, Nicolas Charles
- Oudjda
- Oudry, Jean Baptiste
- Ouessant
- Ouezzane
- Ougrée
- Ouida
- Ouidah
- Oujda
- Oulu
- Ounce
- Ounce
- Ourense
- Our Father
- Ourique
- Ouro Prêto
- Ourthe
- Ouse
- Ousmane, Sembene
- Outer Banks
- Outer Barrier
- Outer Hebrides
- Outer Mongolia
- Outer Space
- Outrigger
- Ouwe, Hartmann Von
- Ovalbumin
- Ovary
- Ovenbird
- Overbeck, Johann Friedrich
- Overbury, Sir Thomas
- Overijssel
- Overland Park
- Overland Trail
- Overmountain Victory National Historic Trail
- Over-the-counter
- Overture
- Ovid
- Oviduct
- Oviedo
- Ovoca
- Ovolo
- Ovum
- Owain Glyndwr
- Owain Gwynedd
- Owatonna
- Owen, John
- Owen, Sir Richard
- Owen, Robert
- Owen, Robert Dale
- Owen, Wilfred
- Owen Falls
- Owen Glendower
- Owens, Jesse
- Owens
- Owensboro
- Owen Sound
- Owen Stanley Range
- Owi
- Owl
- Owl And The Nightingale, The
- Owo
- Owosso
- Owyhee
- Ox
- Oxalic Acid
- Oxalis
- Oxenstierna, Count Axel Gustafsson
- Oxeye
- Oxford, Edward De Vere, 17th earl Of
- Oxford, Robert Harley, 1st earl Of
- Oxford
- Oxford
- Oxford, Provisions Of
- Oxford And Asquith, Herbert Henry Asquith, 1st earl Of
- Oxford Group
- Oxford Movement
- Oxford Sheep
- Oxfordshire
- Oxford University
- Oxidases
- Oxidation And Reduction
- Oxidation Number
- Oxidative Phosphorylation
- Oxide
- Oxnam, Garfield Bromley
- Oxnard
- Oxon
- Oxpecker
- Oxus
- Oxyacetylene Torch
- Oxygen
- Oxygen Tent
- Oxy Group
- Oxytocin
- Oyama, Iwao
- Oyo
- Oyono, Ferdinand Léopold
- Oyster
- Oyster Bay
- Oyster Catcher
- Oyster Plant
- Oz, Amos
- Ozaki, Yukio
- Ozanam, Antoine Frédéric
- Ozark
- Ozark Mountains
- Ozark National Scenic Riverways
- Ozarks, Lake Of The
- Ozarks, The
- Ozawa, Seiji
- ózd
- Ozenfant, Amédée
- Ozias
- Ozick, Cynthia
- Ozni
- Ozone
- Ozone Layer