- Obstetricians & Gynecologists, Ottawa - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Road Vehicles, Ottawa
- Off Road Vehicles Parts & Accessories, Ottawa
- Office Supplies, Equipment & Office Furniture Stores, Ottawa
- Oil & Gas Additives & Supplies, Ottawa
- Oil & Gas Companies, Ottawa
- Oil Change & Lubrication, Ottawa - Auto Oil & Quick Lube
- Oncologists, Ottawa - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Ottawa - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Ottawa
- Opticians, Ottawa
- Optometrists, Ottawa - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Ottawa - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Ottawa
- Ornamental Nursery Products, Ottawa
- Ornamental Nursery Services, Ottawa
- Orthodontist, Ottawa - Teeth Straightening, Invisalign & Dental Braces
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- Orthopedic & Prosthetic Appliances & Shoes, Ottawa - Orthopedic Shoes
- Orthopedists, Ottawa - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Ottawa
- Other Attorneys & Lawyers, Ottawa
- Other Building Materials & Supplies, Ottawa
- Other Lawyers & Attorneys, Ottawa
- Other Lodging, Ottawa
- Outdoor & Lawn & Garden Equipment Repair & Service, Ottawa
- Outdoor Centers, Ottawa
- Outdoor Equipment & Accessories, Ottawa
- Outdoor Furniture & Patio Furniture, Ottawa - Garden Furniture Stores
- Outdoor Furniture Manufacturers, Ottawa
- Outdoor Power Equipment, Ottawa
- Outpatient Services, Ottawa - Outpatient Care
- Ownership Organizations, Ottawa
- Oxygen & Respiratory Equipment & Supplies, Ottawa - Oxygen Concentrator, Tank, Machine, etc
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