- Orthotics & prosthetics service
- Oil field equipment supplier
- Orchard
- Outdoor equestrian facility
- Ophthalmologist
- Otolaryngologist
- Ophthalmology clinic
- Opera house
- Orthopedic clinic
- Outdoor activities
- Otolaryngology clinic
- Organic farm
- Outerwear store
- Orchid grower
- Orchid farm
- Organic drug store
- Off-road race track
- Olive oil manufacturer
- Oil store
- Oxygen equipment supplier