Proper Nouns That Start With “O” are essential in identifying specific people, places, brands, and historical events. From famous cities like Oslo and Orlando to legendary figures like Odin and Obi-Wan Kenobi, these names hold significance across various fields. They shape literature, mythology, geography, and even sports, with teams like the Oklahoma City Thunder and Orlando Magic.
Whether it’s natural wonders like the Ohio River or space-related terms like Orion Nebula, proper nouns beginning with “O” offer a rich linguistic and cultural experience. Expanding your knowledge of these names enhances vocabulary, storytelling, and general awareness of the world around us.
Famous People Proper Nouns That Start With “O”
These individuals have made an impact in various fields, from entertainment to politics.
- Obama – Barack Obama was the 44th president of the United States.
- Oprah – Oprah Winfrey is a famous talk show host.
- Orlando Bloom – Orlando Bloom starred in Pirates of the Caribbean.
- Omar Sy – Omar Sy is a celebrated French actor.
- Ozzy Osbourne – Ozzy Osbourne is a legendary rock musician.
- Oliver Cromwell – Oliver Cromwell led England as Lord Protector.
- Owen Wilson – Owen Wilson is known for his comedy films.
- Octavia Spencer – Octavia Spencer won an Oscar for The Help.
- Odell Beckham Jr. – Odell Beckham Jr. is a famous football player.
- Omarion – Omarion is a singer and former B2K member.
- Olivia Wilde – Olivia Wilde is an actress and director.
- Orson Welles – Orson Welles directed Citizen Kane.
- Omar Sharif – Omar Sharif starred in Doctor Zhivago.
- Oliver Stone – Oliver Stone is a well-known filmmaker.
- Otto von Bismarck – Otto von Bismarck unified Germany.
- Olivia Rodrigo – Olivia Rodrigo is a pop singer.
- Orenthal James Simpson – O.J. Simpson was a famous athlete.
- Oona Chaplin – Oona Chaplin is an actress and Charlie Chaplin’s granddaughter.
- Orlando Cepeda – Orlando Cepeda was a legendary baseball player.
- Oksana Baiul – Oksana Baiul is an Olympic figure skater.
Cities and Towns Proper Nouns That Start With “O”
These cities and towns are famous worldwide for their culture, history, or economic significance.
- Oslo – Oslo is the capital of Norway.
- Oxford – Oxford is home to a world-famous university.
- Orlando – Orlando, Florida, is known for theme parks.
- Oklahoma City – Oklahoma City is the capital of Oklahoma.
- Omaha – Omaha is a major city in Nebraska.
- Osaka – Osaka is a bustling Japanese city.
- Odessa – Odessa is a Ukrainian port city.
- Ottawa – Ottawa is the capital of Canada.
- Oran – Oran is a coastal city in Algeria.
- Oulu – Oulu is a northern Finnish city.
- Olomouc – Olomouc is a historic city in the Czech Republic.
- Oaxaca – Oaxaca is a vibrant city in Mexico.
- Orenburg – Orenburg is a Russian city near Kazakhstan.
- Osh – Osh is a major city in Kyrgyzstan.
- Orvieto – Orvieto is a scenic Italian town.
- Oban – Oban is a coastal town in Scotland.
- Orange – Orange is a city in California.
- Oakland – Oakland is part of the San Francisco Bay Area.
- Olongapo – Olongapo is a city in the Philippines.
- Oamaru – Oamaru is a town in New Zealand.
Countries and Regions Proper Nouns That Start With “O”
These locations play a major role in global geography and politics.
- Oman – Oman is a Middle Eastern country.
- Ontario – Ontario is a province in Canada.
- Occitanie – Occitanie is a region in southern France.
- Oaxaca – Oaxaca is a Mexican state.
- Ossetia – Ossetia is a region divided between Russia and Georgia.
- Orkney – Orkney is an archipelago in Scotland.
- Orellana – Orellana is a province in Ecuador.
- Overijssel – Overijssel is a Dutch province.
- Opole – Opole is a voivodeship in Poland.
- Oromia – Oromia is a regional state in Ethiopia.
- Ostrobothnia – Ostrobothnia is a region in Finland.
- Ogoniland – Ogoniland is an area in Nigeria.
- Ogun State – Ogun State is in southwestern Nigeria.
- Ordos – Ordos is a region in Inner Mongolia, China.
- Orellana – Orellana is a province in Ecuador.
- Oriente – Oriente is an area in Cuba.
- Ouham – Ouham is a prefecture in the Central African Republic.
- Oti Region – Oti Region is in Ghana.
- Owyhee – Owyhee is a historical region in the U.S.
- Oulad Teima – Oulad Teima is a region in Morocco.
Famous Brands Proper Nouns That Start With “O”
Well-known companies and brands that start with “O.”
- Oreo – Oreo is a popular cookie brand.
- Old Spice – Old Spice is a men’s grooming brand.
- Opel – Opel is a German automobile brand.
- Olympus – Olympus produces cameras and optics.
- Oakley – Oakley is a famous eyewear brand.
- Oral-B – Oral-B is known for dental care products.
- Olay – Olay is a skincare brand.
- Orange – Orange is a telecommunications company.
- OtterBox – OtterBox makes protective phone cases.
- OshKosh B’gosh – OshKosh B’gosh makes children’s clothing.
- Onitsuka Tiger – Onitsuka Tiger is a sneaker brand.
- Oatly – Oatly produces oat-based dairy alternatives.
- Overstock – Overstock is an online retailer.
- Off-White – Off-White is a high-end fashion brand.
- Ovo Sound – Ovo Sound is a record label founded by Drake.
- Outback Steakhouse – Outback Steakhouse is a restaurant chain.
- OshKosh Defense – OshKosh Defense makes military vehicles.
- Ocean Spray – Ocean Spray is a juice company.
- O’Reilly Auto Parts – O’Reilly sells automotive parts.
- Orbit Gum – Orbit is a popular chewing gum brand.
Fictional Characters Proper Nouns That Start With “O”
From books, movies, TV shows, and video games, these characters have left a lasting impact.
- Optimus Prime – Optimus Prime leads the Autobots in Transformers.
- Obi-Wan Kenobi – Obi-Wan Kenobi is a Jedi in Star Wars.
- Olaf – Olaf is the lovable snowman from Frozen.
- Oscar the Grouch – Oscar the Grouch is a Sesame Street character.
- Othello – Othello is the tragic hero in Shakespeare’s play.
- Odin – Odin is a Norse god in Marvel comics and mythology.
- Oswald the Lucky Rabbit – Oswald was an early Disney character.
- Otto Rocket – Otto Rocket is a character from Rocket Power.
- Ozma of Oz – Ozma is a character from The Wizard of Oz series.
- Ozymandias – Ozymandias is a character in Watchmen.
- Orochimaru – Orochimaru is a villain in Naruto.
- Owen Grady – Owen Grady is a dinosaur trainer in Jurassic World.
- Officer Judy Hopps – Officer Hopps is the main character in Zootopia.
- Orko – Orko is a magical character in He-Man.
- Otto Mann – Otto Mann is the bus driver in The Simpsons.
- Oddjob – Oddjob is a villain in James Bond.
- Oolong – Oolong is a shapeshifting pig in Dragon Ball.
- Oberyn Martell – Oberyn is a prince in Game of Thrones.
- Oogie Boogie – Oogie Boogie is the villain in The Nightmare Before Christmas.
- Oswald Cobblepot – Oswald Cobblepot is the real name of the Penguin in Batman.
Landmarks and Tourist Attractions
These famous places attract millions of visitors worldwide.
- Old Trafford – Old Trafford is the stadium of Manchester United.
- Oxford University – Oxford University is one of the world’s oldest universities.
- Osaka Castle – Osaka Castle is a historic Japanese landmark.
- Ottawa Parliament Hill – Parliament Hill is in Canada’s capital.
- O2 Arena – O2 Arena is a famous venue in London.
- Orlando’s Disney World – Disney World is a major theme park in Florida.
- Olympia, Greece – Olympia was the birthplace of the Olympic Games.
- Obelisk of Theodosius – This obelisk is in Istanbul, Turkey.
- One World Trade Center – This skyscraper is in New York City.
- Oman’s Sultan Qaboos Grand Mosque – This mosque is a masterpiece of Islamic architecture.
- Old Faithful – Old Faithful is a famous geyser in Yellowstone.
- Oslo Opera House – This building is a landmark in Norway.
- Oahu’s Diamond Head – A volcanic crater in Hawaii.
- Orkney’s Skara Brae – A prehistoric site in Scotland.
- Ocean Park Hong Kong – A famous theme park.
- Outeniqua Mountains – A mountain range in South Africa.
- Ostia Antica – An ancient Roman port city in Italy.
- Otago Peninsula – A scenic spot in New Zealand.
- Orsay Museum – A famous museum in Paris.
- Oberammergau – A village in Germany known for its passion play.
Universities and Colleges
Some of the world’s most renowned institutions start with “O.”
- Oxford University – One of the world’s most prestigious universities.
- Ohio State University – A major public university in the U.S.
- Oregon State University – Located in Corvallis, Oregon.
- Oberlin College – A well-known liberal arts college in Ohio.
- Old Dominion University – Located in Virginia.
- Oral Roberts University – A private Christian university.
- Ottawa University – A Canadian institution in Ottawa.
- Otis College of Art and Design – A leading art school in California.
- Oglethorpe University – A liberal arts college in Georgia.
- Oklahoma State University – A public university in Oklahoma.
- Osaka University – One of Japan’s top universities.
- Occidental College – A liberal arts college in Los Angeles.
- Okanagan College – Located in British Columbia, Canada.
- Open University – A British university offering distance learning.
- Oxford Brookes University – A public university in England.
- Ohio University – A historic public university.
- Olivet Nazarene University – A Christian liberal arts school.
- Osmania University – A university in India.
- Onondaga Community College – Located in Syracuse, New York.
- Oulu University – A university in Finland.
Animals Named Proper Nouns That Start With “O”
Animals, whether real or mythological, that start with “O.”
- Ocelot – Ocelots are wild cats found in the Americas.
- Octopus – The octopus is an intelligent sea creature.
- Orangutan – Orangutans are great apes from Borneo and Sumatra.
- Ostrich – The ostrich is the world’s largest bird.
- Otter – Otters are playful aquatic mammals.
- Orca – Orcas, or killer whales, are apex predators.
- Okapi – The okapi is related to the giraffe.
- Osprey – Ospreys are fish-eating birds of prey.
- Olm – Olms are blind cave-dwelling salamanders.
- Oystercatcher – A bird that eats shellfish.
- Ogre Spider – A unique species of spider.
- Ocean Sunfish – A massive, odd-looking fish.
- Oriental Fire-Bellied Toad – A colorful amphibian.
- Oenpelli Python – A rare snake from Australia.
- Omani Owl – A species of owl found in Oman.
- Oilbird – A nocturnal bird that feeds on fruit.
- Ortolan Bunting – A small songbird.
- Oahu Tree Snail – A rare Hawaiian snail.
- Orange Roughy – A deep-sea fish species.
- Ostracod – Tiny crustaceans found in marine and freshwater habitats.
Historical Events Proper Nouns That Start With “O”
Major events in history that start with “O.”
- Operation Overlord – The codename for the D-Day invasion.
- Ottoman Empire’s Fall – The end of a centuries-old empire.
- October Revolution – The Bolshevik Revolution in Russia.
- Oregon Trail Migration – A major migration event in U.S. history.
- Oil Crisis of 1973 – A global economic event.
- Operation Desert Storm – A key conflict in the Gulf War.
- Opium Wars – 19th-century wars between China and Britain.
- Oslo Accords – Peace agreements between Israel and Palestine.
- Olympic Games (Ancient) – The first recorded Olympic Games.
- Outbreak of WWI – The start of World War I.
Sports Teams Proper Nouns That Start With “O”
These teams come from various sports, including football, baseball, basketball, and soccer.
- Oklahoma City Thunder – An NBA team based in Oklahoma.
- Orlando Magic – An NBA team from Orlando, Florida.
- Oakland Athletics – A Major League Baseball team.
- Olympique Lyonnais – A French football club.
- Olympiacos FC – A Greek football team.
- Ohio State Buckeyes – A college football team.
- Oregon Ducks – A college football and basketball team.
- Ottawa Senators – An NHL hockey team from Canada.
- Osasuna – A football club in Spain.
- Oldham Athletic – A football club in England.
- Orix Buffaloes – A professional baseball team in Japan.
- Orlando City SC – A Major League Soccer team.
- Ostersunds FK – A Swedish football club.
- Oxford United – A football team in England.
- Odisha FC – An Indian football team.
- Oklahoma Sooners – A college football powerhouse.
- Ospreys Rugby – A Welsh rugby team.
- Osaka Evessa – A Japanese professional basketball team.
- Ontario Reign – A minor league hockey team.
- Omaha Storm Chasers – A minor league baseball team.
Rivers, Mountains, and Natural Landforms
Nature’s wonders that start with “O.”
- Ohio River – A major river in the U.S.
- Orinoco River – A long river in South America.
- Orange River – A river in South Africa.
- Ouse River – A river in England.
- Oka River – A tributary of the Volga River in Russia.
- Oregon Trail – A famous historical route in the U.S.
- Ojos del Salado – The highest volcano in the world.
- Olympic Mountains – A mountain range in Washington State.
- Ozark Mountains – A highland region in the U.S.
- Ogaden Desert – A desert in Ethiopia.
- Oymyakon – One of the coldest inhabited places in Russia.
- Ostrander Lake – A scenic lake in California.
- Okavango Delta – A vast inland delta in Botswana.
- Onyx River – The longest river in Antarctica.
- Ob River – A major river in Russia.
- Ombla River – A short river in Croatia.
- Orongorongo River – A river in New Zealand.
- Otway Ranges – A mountain range in Australia.
- Onekotan Island – A volcanic island in Russia.
Mythology and Folklore Proper Nouns That Start With “O”
Characters, gods, and mythical places from different cultures.
- Odin – The chief god in Norse mythology.
- Osiris – The Egyptian god of the afterlife.
- Orpheus – A legendary musician in Greek mythology.
- Oceanus – A primordial Titan in Greek mythology.
- Oberon – The king of the fairies in Shakespeare’s A Midsummer Night’s Dream.
- Odysseus – A Greek hero from The Odyssey.
- Oizys – The Greek goddess of misery.
- Orunmila – A deity in Yoruba mythology.
- Ometeotl – A dual-gendered deity in Aztec mythology.
- Ophion – A serpent-like deity in Greek myths.
- Okeanos – The Greek personification of the ocean.
- Oberion – A legendary knight in European folklore.
- Oyamatsumi – A Japanese mountain god.
- Ostara – A Germanic goddess associated with spring.
- Ollantay – A legendary hero in Incan folklore.
- Orun – A celestial realm in Yoruba belief.
- Ono-no-Komachi – A famous poet from Japanese folklore.
- Onmoraki – A Japanese mythical bird demon.
- Ogre – A monstrous creature in various folklores.
- Oschaert – A ghostly figure from Flemish folklore.
Conclusion
Exploring proper nouns that start with “O” takes us through a fascinating journey across various aspects of life—famous people, iconic places, legendary characters, sports teams, and even celestial bodies. These words are more than just names; they represent history, culture, and human achievements.
Whether you’re expanding your vocabulary, improving your writing, or just curious, this list provides a rich collection of over 200 proper nouns that can help you recognize and appreciate the importance of names in different fields. The next time you hear a name beginning with “O,” you’ll have a deeper
Jessica is a seasoned writer with over 5 years of experience in the Noun niche. Her expertise lies in creating impactful, well-researched, and reader-focused content. With a strong commitment to excellence, Jessica has built a reputation for delivering high-quality work that informs, engages, and inspires her audience.