- Hotel Oltnerhof
- Neuhardstrasse 23
- 4600 Olten
- https://www.oltnerhof.ch
- +41 62 296 55 66
- Hotel Olympia
- Furusandstrasse 7
- 3905 Saas-Almagell
- http://www.hotel-olympia.ch
- +41 27 957 16 76
- Hotel One66
- Alte Bildstrasse 6
- 9015 St. Gallen
- https://www.hotel-one66.ch
- +41 71 314 71 71
- Hotel Onya Resort & Spa
- Alte Gasse 1
- 3997 Bellwald
- http://www.alte-gasse.ch
- +41 27 971 21 41
- Hotel Orchidee
- Schmiedengasse 20
- 3400 Burgdorf
- https://www.hotel-orchidee.ch
- +41 34 420 77 77
- Hôtel Palafitte
- Route des Gouttes-d'Or 2
- 2000 Neuchâtel
- https://www.palafitte.ch
- +41 32 723 02 02