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- Ovation
- Oven
- Overbeck, Johann Friedrich
- Overbury, Sir Thomas
- Overdoor
- Overmantel
- Oversoul
- Overstone, Samuel Jones Loyd, 1st Baron
- Overt Act
- Overture
- Overysel
- Ovid
- Oviedo (province)
- Oviedo (city)
- Oviedo y Valdés, Gonzalo Fernández de
- Ovolo
- Owatonna
- Owego
- Owen, Sir Hugh
- Owen, John (Welsh epigrammatist)
- Owen, John (English divine)
- Owen, Sir Richard
- Owen, Robert
- Owens, John
- Owensboro
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- Owen Sound
- Owl
- Owling
- Owosso
- Ox
- Oxalic Acid
- Oxalis
- Oxazoles
- Oxe, Peder
- Oxenbridge, John
- Oxenford, John
- Oxenham, Henry Nutcombe
- Oxenstjerna
- Oxford, Earls of
- Oxford, Edward de Vere, 17th Earl of
- Oxford, John de Vere, 13th Earl of
- Oxford, Robert de Vere, 9th Earl of
- Oxford, Robert Harley, 1st Earl of
- Oxford
- Oxford (Ohio)
- Oxford, Provisions of
- Oxfordian
- Oxfordshire
- Oxide
- Oximes
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- Oxus
- Oxygen
- Oxyhydrogen Flame
- Oyama, Iwao, Prince
- Oyer and Terminer
- Oyster
- Oyster Bay
- Oyster-catcher
- Oystermouth
- Ozanam, Antoine Frédéric
- Ozieri
- Ozokerite
- Ozone
- P
- Paarl
- Pabianice
- Pabna
- Pabst, Frederick
- Paca
- Pacatus Drepanius, Latinus
- Pacchia, Girolamo del, & Pacchiarotto, Jacopo
- Pace, Richard
- Pace
- Pache, Jean Nicolas
- Pacheco, Francisco
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