- Orthotics & prosthetics service
- Occupational therapist
- Outlet store
- Outdoor clothing and equipment shop
- Outdoor sports store
- Office space rental agency
- Office equipment supplier
- Office supply
- Office equipment rental service
- Outdoor swimming pool
- Open university
- Organic farm
- Office equipment repair service
- Optician
- Optical wholesaler
- Occupational medical physician
- Optical products manufacturer
- Outlet mall
- Organic shop
- Oyster bar restaurant