| | Omaezaki Land | Omaezaki, Shizuoka, Japan | - | - | - | ≤ |
| | Opryland USA | Nashville, Tennessee, United States | - | | - | |
| | Oriental Park | Baiyun, Guangzhou, Guangdong, China | - | | - | |
| | Oriental Science Fiction Valley | Nanming, Guiyang, Guizhou, China | - | | - | |
| | Orient Culture Park | Xiaoshan, Hangzhou, Zhejiang, China | - | ≤ | - | - |
| | Orumieh Park | Urmia, West Azerbaijan, Iran | - | ≤ | - | ≤ |
| | Ostdeutsche Austellung 1911 | Poznań, Wielkopolskie, Poland | - | | - | |
| | Otaru Expo | Otaru, Shiribeshi, Hokkaido, Japan | - | | - | |
| | Owasco Lake Park | Auburn, New York, United States | - | | - | - |
| | Oyama Yuenchi | Oyama, Tochigi, Japan | - | | - | |
| | Pabst Park | Milwaukee, Wisconsin, United States | - | ≤ | - | ≥ |
| | Pacific City | Burlingame, California, United States | - | | - | |
| | Pacific Ocean Park | Santa Monica, California, United States | - | | - | |
| | Palisades Amusement Park | Cliffside Park, New Jersey, United States | - | | - | |
| | Panama-Pacific International Exposition | San Francisco, California, United States | - | | - | |
| | Pan-American Exposition | Buffalo, New York, United States | - | | - | |
| | Paradise Lake | Wills Township, Ohio, United States | - | | - | |
| | Paradise Park | New York, New York, United States | - | | - | |
| | Paradise Park | Rye, New York, United States | - | | - | |
| | Paragon Park | Hull, Massachusetts, United States | - | | - | |
| Parc Avenue | Lanas, Auvergne-Rhône-Alpes, France | - | - | - | |
| | Parc Belmont | Montréal, Québec, Canada | - | | - | |
| Parc de la Toison d'Or | Dijon, Bourgogne-Franche-Comté, France | - | | - | |
| | Parc de Lomme | Lille, Hauts-de-France, France | - | | - | |