| Olton Country Club | Olton | Texas |  United States of America | inactive |
| Olton Golf Club | Solihull | West Midlands |  England | inactive |
| Olympia Country & Golf Club | Olympia | Washington | United States of America | inactive |
| Olympia Fields Country Club | Olympia Fields | Illinois | United States of America | inactive |
| Olympia Golf Igls | Igls | Tyrol |  Austria | inactive |
| Olympia Hills Golf Conference Center | Universal City | Texas | United States of America | inactive |
| Olympic Country Club | Goyang | Gyeonggi |  South Korea | inactive |
| Olympic Country Club | Uenohara | Yamanashi |  Japan | inactive |
| Olympic Golf Club | Miki | Hyogo | Japan | inactive |
| Olympic Hills Golf Club | Eden Prairie | Minnesota | United States of America | inactive |
| Olympic Staff Ashikaga Golf Course | Ashikaga | Tochigi | Japan | inactive |
| Olympic Staff Country Club - Tsuga Golf Course | Shimotsuga | Tochigi | Japan | inactive |
| Olympic View Golf Club | Victoria | British Columbia |  Canada | inactive |
| Olympus | Icheon | Gyeonggi | South Korea | inactive |
| Olympus Golf Club | Amsterdam | Noord-Holland |  Netherlands | inactive |
| Om | Hisings Backa | Västra Götaland |  Sweden | inactive |
| Omagari Shimin Golf Club | Daisen | Akita | Japan | inactive |
| Omagh Gof Club | Omagh | Tyrone | Northern Ireland | inactive |
| Omaha Beach Golf Club | Rodney District | Auckland |  New Zealand | inactive |
| Omaha Country Club | Omaha | Nebraska | United States of America | inactive |
| Omakau Golf Club | Omakau | Otago | New Zealand | inactive |
| Omama Country Club | Midori | Gunma | Japan | inactive |
| Omanu Golf Club | Mount Maunganui | Bay of Plenty | New Zealand | inactive |
| Omarama Golf Club | Omarama | Otago | New Zealand | inactive |
| Ombergs Golf | Ödeshög | Östergötland | Sweden | inactive |
| Ombersley Golf Club | Droitwich | Worcestershire | England | inactive |
| Ombria Golf Course Algarve | Tôr | Loulé Algarve |  Portugal | inactive |
| Ome Golf Club | Ome | Tokyo | Japan | inactive |
| Omeo Golf Club | Omeo | Victoria |  Australia | inactive |
| Omi Country Club | Konan | Shiga | Japan | inactive |
| Omi Hills Golf Club | Gamo | Shiga | Japan | inactive |
| Omigawa-Tokyu Golf Club | Katori | Chiba | Japan | inactive |
| Omineca Golf & Country Club | Vanderhoof | British Columbia | Canada | inactive |
| Omiya Country Club | Saitama | Saitama | Japan | inactive |
| Omiya Golf Club | Ageo | Saitama | Japan | inactive |
| Omiya Kokusai Country Club | Saitama | Saitama | Japan | inactive |
| Omni Barton Creek Resort & Spa | Austin | Texas | United States of America | inactive |
| Omni Barton Creek Resort - Palmer Lakeside Course | Spicewood | Texas | United States of America | inactive |
| Omni Bedford Springs Resort | Bedford | Pennsylvania | United States of America | inactive |
| Omni Hotels & Resort | Broomfield | Colorado | United States of America | inactive |
| Omni La Costa Resort & Spa | Carlsbad | California | United States of America | inactive |
| Omni Mount Washington Resort | Bretton Woods | New Hampshire | United States of America | inactive |
| OMNI ORLANDO RESORT AT CHAMPIONSGATE | Championsgate | Florida | United States of America | inactive |
| Omni Rancho Las Palmas Resort | Rancho Mirage | California | United States of America | inactive |
| Omni Tucson National Resort | Tucson | Arizona | United States of America | inactive |
| Omoigawa Golf Club | Kanuma | Tochigi | Japan | inactive |
| Omokoroa Golf Club | Omokoroa | Bay of Plenty | New Zealand | inactive |
| Omotezao Kokusai Golf Club | Shibata | Miyagi | Japan | inactive |
| Omurasaki Golf Club | Hiki | Saitama | Japan | inactive |
| On Top of the World | Clearwater | Florida | United States of America | inactive |