- Occupational Health & Safety, Ajax
- Occupational Health Care Professionals, Ajax
- Occupational Therapy, Ajax - Occupational Health Specialists
- Office Partitions & Dividers, Ajax
- Office Space on Rent, Ajax - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Ajax
- Oil & Gas Companies, Ajax
- Oil Change & Lubrication, Ajax - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Ajax
- Optometrists, Ajax - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Ajax - Eye Clinics
- Oral Surgeon, Ajax - Dentists - Oral & Maxillofacial Surgeons
- Organs Tuning & Repair, Ajax
- Ornamental Nursery, Ajax
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- Ornamental Nursery Services, Ajax
- Orthodontist, Ajax - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Ajax
- Orthopedic & Prosthetic Appliances & Shoes, Ajax - Orthopedic Shoes
- Orthopedic Appliances, Ajax
- Other Building Materials & Supplies, Ajax
- Other Electrical Products, Ajax
- Other Lodging, Ajax
- Outdoor Advertising & Billboard, Ajax
- Outdoor Equipment & Accessories, Ajax
- Outdoor Furniture, Ajax
- Outpatient Services, Ajax - Outpatient Care
- Overhead Door, Ajax
- Oxygen & Respiratory Equipment & Supplies, Ajax - Oxygen Concentrator, Tank, Machine, etc
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