| Name | Website | |||
| Obertauern - Hotel Landhaus Panorama - Austria |
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| Oetker Collection - Masterpiece Hotels |
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| Omaha-Global Hotel Alliance (Hotelfinder-gha) - USA |
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| Orea Hotel Pyramida - 16901 Praha - Czech Republic |
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| Orient-Hotel L'Hermitage - Mallorca-Spain |
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| Oslo - Hotels - Norway / Norwegen - Splendia |
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| Oslo - Grandhotel - Norway / Norwegen |
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| Oslo - Hotelfinder Norway-Norwegen (Venere) |
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