| Oost-Zuid | Groesbeek | Gelderland |  Netherlands | inactive |
| Oostwoud-Westwoud | Benthuizen | Zuid-Holland | Netherlands | inactive |
| Ootacamund Gymkhana Golf Club | The Nilgiris | Tamil Nadu |  India | inactive |
| Ootaka | Housu | Ishikawa |  Japan | inactive |
| Ootawara Golf Club | Nasu | Tochigi | Japan | inactive |
| Ooyodogawa Golf Course | Miyazaki | Miyazaki | Japan | inactive |
| Opal Cove Resort Golf Course | Coffs Harbour | New South Wales |  Australia | inactive |
| Open | Cotgrave | Nottinghamshire |  England | inactive |
| Open | Dongguan | Guangdong |  China | inactive |
| Open | Fingal | Victoria | Australia | inactive |
| Open 9 | Myrtle Beach | South Carolina |  United States of America | inactive |
| OPEN GOLF St. Johann Alpendorf | Sankt Johann im Pongau | Salzburg |  Austria | inactive |
| Open Golf Zandvoort | Zandvoort | Noord-Holland | Netherlands | inactive |
| Open.9 Golf Eichenried | Moosinning | Bavaria |  Germany | inactive |
| Openbare Golfbaan Kralingen | Rotterdam | Zuid-Holland | Netherlands | inactive |
| Openbare Golfclub Dronten | Dronten | Flevoland | Netherlands | inactive |
| Oporto Golf Club | Espinho | Beira Litoral |  Portugal | inactive |
| Opotiki Golf Club | Opotiki | Bay of Plenty |  New Zealand | inactive |
| Oppdal Golfklubb | Oppdal | Sør-Trøndelag |  Norway | inactive |
| Oppegård Golfklubb | Oppegård | Akershus | Norway | inactive |
| Oppenheimer Golf Club | Welkom | Free State |  South Africa | inactive |
| Opunake Golf Course | Opunake | Taranaki | New Zealand | inactive |
| Oquirrh Hills Golf Course | Tooele | Utah | United States of America | inactive |
| Ora Country Club | Jeju | Jeju |  South Korea | inactive |
| Orange | Savoy | Illinois | United States of America | inactive |
| Orange | Parrish | Florida | United States of America | inactive |
| Orange | Anseong | Gyeonggi | South Korea | inactive |
| Orange | Tomioka | Gunma | Japan | inactive |
| Orange | Haga | Tochigi | Japan | inactive |
| Orange | Bryanston | Wiltshire | England | inactive |
| Orange | Lésigny | Ile-de-France |  France | inactive |
| Orange (Executive - Par 3) | Sankt Johann im Pongau | Salzburg | Austria | inactive |
| Orange 9 | Whitney Point | New York | United States of America | inactive |
| Orange Beach Golf Center | Orange Beach | Alabama | United States of America | inactive |
| Orange Blossom Hills Golf and Country Club | Lady Lake | Florida | United States of America | inactive |
| Orange County National Golf Club | Orlando | Florida | United States of America | inactive |
| Orange Dunes Golf Club | Incheon | Incheon | South Korea | inactive |
| Orange Ex-Services Country Golf Club | Orange | New South Wales | Australia | inactive |
| Orange Hills Country Club | Orange | Connecticut | United States of America | inactive |
| Orange Lake Resort and Country Club | Kissimmee | Florida | United States of America | inactive |
| Orange Lakes Golf Club | Sheikh Zayed City | Giza |  Egypt | inactive |
| Orange Park Country Club | Orange Park | Florida | United States of America | inactive |
| Orange Shiga Country Club | Koka | Shiga | Japan | inactive |
| Orange Tree Golf Club | Orlando | Florida | United States of America | inactive |
| Orange Tree Golf Club | Scottsdale | Arizona | United States of America | inactive |
| Orangebrook Golf & Country Club | Hollywood | Florida | United States of America | inactive |
| Orangeburg Country Club | Orangeburg | South Carolina | United States of America | inactive |
| Orangedene Golf Club | Orangedene | Limpopo | South Africa | inactive |
| Orangeville Golf & Country Club | Alton | Ontario |  Canada | inactive |
| Oranje | Biddinghuizen | Flevoland | Netherlands | inactive |