- Oldtwon Hostel Otter
- Oberdorfstrasse 7
- 8001 Zürich
- http://oldtownzurich.com
- +41 44 251 22 07
- Olten Swiss Quality Hotel
- Bahnhofstrasse 5
- 4600 Olten
- https://www.hotelolten.ch
- +41 62 287 32 32
- Olympic Hôtel
- Rue Louis-Antille 9
- 3963 Crans-Montana
- http://www.hotelolympic.ch
- +41 27 481 29 85
- Opera Hotel Zürich
- Dufourstrasse 5
- 8008 Zürich
- https://www.operahotel.ch
- +41 44 258 99 99
- Ostello Cappuccini
- Via Lucerna 7
- 6760 Faido
- http://www.ostellofaido.com
- +41 91 866 26 25
- Ostello Montebello - Bellinzona Youth Hostel
- Via Nocca 4
- 6500 Bellinzona
- https://www.youthhostel.ch/bellinzona
- +41 91 825 15 22
- Ostello Scudellate
- Via Cantonale 124
- 6838 Scudellate
- http://www.ostello-scudellate.ch
- +41 91 684 11 36
- Osteria Posse
- Via Valle Verzasca
- 6633 Lavertezzo
- https://www.aiposse.ch
- +41 91 746 17 96
- OVERLOOK Lodge by CERVO Mountain Resort
- Riedweg 64
- 3920 Zermatt
- https://www.overlook.swiss
- +41 27 968 12 12