| 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 Resort Algarve | 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 |
| On Top of the World Golf Club | Ocala | Florida | United States of America | inactive |
| On Top of the World Golf Club | Clearwater | Florida | United States of America | inactive |
| Onahama Country Club | Iwaki | Fukushima | Japan | inactive |
| Onahama Ocean Hotel & Golf Club | Iwaki | Fukushima | Japan | inactive |
| Onaping Golf and Beach Club | Onaping | Ontario | Canada | inactive |
| Onawa Country Club | Onawa | Iowa | United States of America | inactive |
| One&Only Palmilla Golf Club | San Jose del Cabo | Baja California Sur |  Mexico | inactive |
| One-Way Golf Club | Tsuchiura | Ibaraki | Japan | inactive |
| One/Two | Highland | New York | United States of America | inactive |
| Oneida Community Golf Club | Oneida | New York | United States of America | inactive |
| Oneida Golf & Riding Club | Green Bay | Wisconsin | United States of America | inactive |
| Oneida Municipal Golf Course | Oneida | Tennessee | United States of America | inactive |
| Oneka Ridge Golf Course | White Bear Lake | Minnesota | United States of America | inactive |