- Obstetricians & Gynecologists, Owen Sound - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office & Meeting Equipment & Supplies Rental, Owen Sound
- Office Buildings & Parks, Owen Sound
- Office Furniture & Equipment Rental & Leasing, Owen Sound
- Office Supplies, Equipment & Office Furniture Stores, Owen Sound
- Oil & Gas Companies, Owen Sound
- Oil & Petroleum Products, Owen Sound - Merchant, Wholesalers, etc
- Oil And Petroleum Products, Owen Sound
- Oil Change & Lubrication, Owen Sound - Auto Oil & Quick Lube
- Ophthalmologists, Owen Sound - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Owen Sound
- Opticians, Owen Sound
- Optometrists, Owen Sound - Eye Doctors, Physicians & Surgeons (Optometry)
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- Optometry Clinics, Owen Sound - Eye Clinics
- Oral Surgeon, Owen Sound - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Owen Sound
- Ornamental Nursery, Owen Sound
- Ornamental Nursery Services, Owen Sound
- Orthopedic & Prosthetic Appliances & Shoes, Owen Sound - Orthopedic Shoes
- Orthopedic Appliances, Owen Sound
- Other Building Materials & Supplies, Owen Sound
- Outdoor Equipment & Accessories, Owen Sound
- Outdoor Furniture, Owen Sound
- Outpatient Services, Owen Sound - Outpatient Care
- Overhead Door, Owen Sound
- Oxygen & Respiratory Equipment & Supplies, Owen Sound - Oxygen Concentrator, Tank, Machine, etc
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