Ultra-LuxuryCity
Bangkok, Thailand
39 rooms
Opened 2012
Bill Bensley (Bensley Design Studios) / Krissada Sukosol Clapp
Bangkok, Thailand
Spa & Wellness
The Siam Spa & Wellness
The Opium Spa at The Siam is a subterranean sanctuary of Siamese and Australian botanical wellness. Facilities include private treatment suites, herbal steam rooms, saunas, the 22-metre riverfront infinity pool, and therapies utilizing chemical-free Sodashi skincare, as well as traditional Sak Yant sacred tattoos.
8:00am – 8:00pm daily
Facilities
- 22-metre outdoor riverfront infinity swimming pool overlooking the Chao Phraya
- Opium Spa with private treatment suites, steam rooms, and Sodashi therapies
- Only full-size professional Muay Thai boxing ring in a luxury hotel in Bangkok
- Private wooden luxury motor launch for scheduled transfers down the river
Signature Treatment
Siamese Herbal Compress and Coconut Polish and Opium Restorative Deep Tissue Massage.
The Siam spa FAQ
- What is the Opium Spa?
- The Opium Spa is a luxury wellness facility offering Sodashi botanical skincare, steam rooms, and Thai massage.
- Is there a boxing ring on site?
- Yes, The Siam features the only full-size professional Muay Thai boxing ring in a luxury hotel in Bangkok.
- What signature treatment is featured?
- The signature ritual is the Siamese Herbal Compress Polish and Opium Restorative Deep Tissue Massage.
- What are the spa operating hours?
- The Opium Spa is open daily from 8:00am to 8:00pm.
Reviewed by Hotel Flock · Last updated September 2026