- Obstetricians & Gynecologists, Toronto - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Toronto
- Occupational Health Care Professionals, Toronto
- Occupational Therapy, Toronto - Occupational Health Specialists
- Office & Meeting Equipment & Supplies Rental, Toronto
- Office Buildings & Parks, Toronto
- Office Furniture & Equipment Rental & Leasing, Toronto
- Office Furniture Manufacturers, Toronto
- Office Partitions & Dividers, Toronto
- Office Space on Rent, Toronto - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Toronto
- Office Wall Units, Toronto
- Offset & Photolithographic Printing, Toronto
- Oil & Gas Additives & Supplies, Toronto
- Oil & Gas Companies, Toronto
- Oil & Gas Exploration & Development, Toronto - Oil Field Exploration, Monitoring & Remediation
- Oil & Gas Producers, Toronto - Companies
- Oil & Petroleum Products, Toronto - Merchant, Wholesalers, etc
- Oil & Petroleum Retail, Toronto
- Oil And Petroleum Products, Toronto
- Oil Bulk Stations, Toronto
- Oil Change & Lubrication, Toronto - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Toronto - Oil Companies
- Oil Well Equipment & Supplies, Toronto
- Open Door Church, Toronto
- Opera Companies, Toronto
- Ophthalmologists, Toronto - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Toronto
- Opticians, Toronto
- Optometrists, Toronto - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Toronto - Eye Clinics
- Oral Surgeon, Toronto - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Toronto
- Organ Donation & Tissue Banks, Toronto
- Organizing Services & Products – Household & Business, Toronto
- Organs Tuning & Repair, Toronto
- Oriental Goods & Products Stores, Toronto
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- Oriental Massage, Toronto
- Oriental Restaurants, Toronto
- Ornamental Nursery, Toronto
- Ornamental Nursery Consultants, Toronto
- Ornamental Nursery Products, Toronto
- Ornamental Nursery Services, Toronto
- Orthodontist, Toronto - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Toronto
- Orthopedic & Prosthetic Appliances & Shoes, Toronto - Orthopedic Shoes
- Orthopedic Appliances, Toronto
- Orthopedists, Toronto - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Toronto
- Other Attorneys & Lawyers, Toronto
- Other Attorneys & Lawyers, Toronto
- Other Building Materials & Supplies, Toronto
- Other Electrical Products, Toronto
- Other Industrial Contractors, Toronto
- Other Industrial Goods, Toronto
- Other Lawyers & Attorneys, Toronto
- Other Lodging, Toronto
- Other Specialties, Toronto - Doctors, Physicians & Surgeons
- Outboard Motors, Toronto
- Outdoor & Lawn & Garden Equipment Repair & Service, Toronto
- Outdoor Advertising & Billboard, Toronto
- Outdoor Centers, Toronto
- Outdoor Equipment & Accessories, Toronto
- Outdoor Furniture, Toronto
- Outerwear & Accessories Manufacturers, Toronto
- Outerwear Stores, Toronto - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Clinics, Toronto - Care & Treatment Centers
- Outpatient Services, Toronto - Outpatient Care
- Outplacement Counseling, Toronto
- Outsourcing Services, Toronto
- Overhead Door, Toronto
- Oxygen & Respiratory Equipment & Supplies, Toronto - Oxygen Concentrator, Tank, Machine, etc
- Oyster Bar Restaurants, Toronto
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