- Occupational Health & Safety, Brantford
- Occupational Health Care Professionals, Brantford
- Office & Meeting Equipment & Supplies Rental, Brantford
- Office Furniture & Equipment Rental & Leasing, Brantford
- Office Supplies, Equipment & Office Furniture Stores, Brantford
- Oil & Petroleum Products, Brantford - Merchant, Wholesalers, etc
- Oil And Petroleum Products, Brantford
- Oil Change & Lubrication, Brantford - Auto Oil & Quick Lube
- Ophthalmologists, Brantford - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Brantford
- Opticians, Brantford
- Optometrists, Brantford - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Brantford - Eye Clinics
- Oral Surgeon, Brantford - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Brantford
- Oriental Restaurants, Brantford
- Ornamental Greenhouses, Brantford
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- Ornamental Nursery, Brantford
- Ornamental Nursery Services, Brantford
- Orthodontist, Brantford - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Brantford - Orthopedic Shoes
- Orthopedic Appliances, Brantford
- Orthopedists, Brantford - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Brantford
- Other Electrical Products, Brantford
- Other Industrial Contractors, Brantford
- Other Industrial Goods, Brantford
- Outdoor Advertising & Billboard, Brantford
- Outdoor Equipment & Accessories, Brantford
- Outdoor Furniture, Brantford
- Outerwear Stores, Brantford - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Brantford - Outpatient Care
- Overhead Door, Brantford
- Oxygen & Respiratory Equipment & Supplies, Brantford - Oxygen Concentrator, Tank, Machine, etc
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