- Orthoptist
- Orthopedic clinic
- Orphanage
- Opel dealer
- Oriental medicine clinic
- Occupational therapist
- Ophthalmologist
- Outdoor clothing and equipment shop
- Otolaryngology clinic
- Osteopath
- Ophthalmology clinic
- Oil & natural gas company
- Oriental medical clinic
- Occupational medical physician
- Off roading area
- Outdoor swimming pool
- Outdoor bath
- Offal barbecue restaurant
- Optical wholesaler
- Optical products manufacturer