| Omeo Golf Club | Omeo | Victoria |  Australie | inactive |
| Omi Country Club | Konan | Shiga |  Japon | inactive |
| Omi Hills Golf Club | Gamo | Shiga | Japon | inactive |
| Omigawa-Tokyu Golf Club | Katori | Chiba | Japon | inactive |
| Omineca Golf & Country Club | Vanderhoof | British Columbia |  Canada | inactive |
| Omiya Country Club | Saitama | Saitama | Japon | inactive |
| Omiya Golf Club | Ageo | Saitama | Japon | inactive |
| Omiya Kokusai Country Club | Saitama | Saitama | Japon | inactive |
| Omni Barton Creek Resort & Spa | Austin | Texas |  États-Unis | inactive |
| Omni Barton Creek Resort - Palmer Lakeside Course | Spicewood | Texas | États-Unis | inactive |
| Omni Bedford Springs Resort | Bedford | Pennsylvania | États-Unis | inactive |
| Omni Hotels & Resort | Broomfield | Colorado | États-Unis | inactive |
| Omni La Costa Resort & Spa | Carlsbad | California | États-Unis | inactive |
| Omni Mount Washington Resort | Bretton Woods | New Hampshire | États-Unis | inactive |
| OMNI ORLANDO RESORT AT CHAMPIONSGATE | Championsgate | Florida | États-Unis | Actif |
| Omni Rancho Las Palmas Resort | Rancho Mirage | California | États-Unis | inactive |
| Omni Tucson National Resort | Tucson | Arizona | États-Unis | inactive |
| Omoigawa Golf Club | Kanuma | Tochigi | Japon | inactive |
| Omokoroa Golf Club | Omokoroa | Bay of Plenty |  Nouvelle-Zélande | inactive |
| Omotezao Kokusai Golf Club | Shibata | Miyagi | Japon | inactive |
| Omurasaki Golf Club | Hiki | Saitama | Japon | inactive |
| On Top of the World | Clearwater | Florida | États-Unis | inactive |
| On Top of the World Golf Club | Ocala | Florida | États-Unis | inactive |
| On Top of the World Golf Club | Clearwater | Florida | États-Unis | inactive |
| Onahama Country Club | Iwaki | Fukushima | Japon | inactive |
| Onahama Ocean Hotel & Golf Club | Iwaki | Fukushima | Japon | inactive |
| Onaping Golf and Beach Club | Onaping | Ontario | Canada | inactive |
| Onawa Country Club | Onawa | Iowa | États-Unis | inactive |
| One&Only Palmilla Golf Club | San Jose del Cabo | Baja California Sur |  Mexique | inactive |
| One-Way Golf Club | Tsuchiura | Ibaraki | Japon | inactive |
| One/Two | Highland | New York | États-Unis | inactive |
| Oneida Community Golf Club | Oneida | New York | États-Unis | inactive |
| Oneida Golf & Riding Club | Green Bay | Wisconsin | États-Unis | inactive |
| Oneida Municipal Golf Course | Oneida | Tennessee | États-Unis | inactive |
| Oneka Ridge Golf Course | White Bear Lake | Minnesota | États-Unis | inactive |
| Onekaka Links Golf Club | Onekaka | Tasman | Nouvelle-Zélande | inactive |
| Oneonta Country Club | Oneonta | New York | États-Unis | inactive |
| Oneota Golf & Country Club | Decorah | Iowa | États-Unis | inactive |
| Onewhero Golf Club | Auckland | Auckland | Nouvelle-Zélande | inactive |
| Onga | Onga | Fukuoka | Japon | inactive |
| Onga Onga Golf Club | Onga Onga | Hawke's Bay | Nouvelle-Zélande | inactive |
| ONGC /Ligripukhuri Golf Club | Nazira | Assam |  Inde | inactive |
| Ongerup Golf Club | Ongerup | Western Australia | Australie | inactive |
| Onion Creek Golf Club | Austin | Texas | États-Unis | inactive |
| Onishi | Onishi | Gunma | Japon | inactive |
| Onishi Terrace Golf Club | Nakagami | Okinawa | Japon | inactive |
| Onneley Golf Club | Cheshire | Staffordshire |  Angleterre | inactive |
| Onneyu Kokusai Country Club | Tokoro | Hokkaido | Japon | inactive |
| Ono Golf Club | Ono | Hyogo | Japon | inactive |
| Ono Grand Country Club | Ono | Hyogo | Japon | inactive |