- Others
- Osteopath
- Outdoor swimming pool
- Occupational therapist
- Orthopedic surgeon
- Oncologist
- Orthopedic clinic
- Occupational medical physician
- Orthotics & prosthetics service
- Occupational health service
- Outdoor furniture store
- Outdoor sports store
- Obstetrician-gynecologist
- Outdoor clothing and equipment shop
- Otolaryngologist
- Ophthalmologist
- Oil refinery
- Oil change service
- Office supply store
- Optometrist