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