- Others
- Outdoor sports store
- Office space rental agency
- Office supply store
- Occupational therapist
- Occupational safety and health
- Outdoor activity organiser
- Office equipment supplier
- Office furniture store
- Oil refinery
- Office
- Outdoor clothing and equipment shop
- Outdoor bath
- Osteopath
- Off-road race track
- Optician
- Optometrist
- Outdoor furniture store
- Oil & natural gas company
- Outlet store