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- Ottumwa Otuke Otukian Otus Otway Otà Ouachita Ouachita Mountains Ouagadougou Ouargla Oubangui Oubangui-Chari Oudh Oudjda Oudtshoorn Ouessant, Île d' Ouida Ouija Ouled Naïl Oulu Our Father Our Lord's candle Our-Lady's-bedstraw Our-Lady's-mint Our-Lady's-thistle Ouro Prêto Ourouparia Ourthe Oushak Out Islands Outer Banks Oval Office Ovambo
- Ovamboland Overijssel Overland Park Ovid Ovidae Oviedo Ovimbundu Ovis Ovula Owasco Lake Owen Owen Falls Owen Stanley Range Owenia Owenism Owenite Owens Owensboro Owyhee Oxalidaceae Oxamine dye Oxbridge Oxenstierna Oxfam Oxford Group movement Oxford Grouper Oxford India paper Oxford bag Oxford comma Oxford corner Oxford down Oxford frame Oxford movement
- Oxford ocher Oxford unit Oxford weed Oxfordism Oxfordshire Oxnard Oxon Oxonian Oxyaena Oxybelis Oxycanus Oxycoccus Oxyopidae Oxyrhyncha Oxystomata Oxytricha Oxytropis Oyster Bay Oyster Bay pine Ozanna Ozark Ozarker Ozarks, Lake of the Ozonium Oécusse o o tempora! o mores! o' o'clock o'er o'io o-be-joyful o-grade