- Occupational Health & Safety, Vaughan
- Occupational Health Care Professionals, Vaughan
- Office & Meeting Equipment & Supplies Rental, Vaughan
- Office Furniture & Equipment Rental & Leasing, Vaughan
- Office Space on Rent, Vaughan - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Vaughan
- Ophthalmologists, Vaughan - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Vaughan
- Opticians, Vaughan
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- Optometrists, Vaughan - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Vaughan - Eye Clinics
- Orthopedic & Prosthetic Appliances & Shoes, Vaughan - Orthopedic Shoes
- Other Building Materials & Supplies, Vaughan
- Other Lodging, Vaughan
- Outdoor Equipment & Accessories, Vaughan
- Outdoor Furniture, Vaughan
- Oxygen & Respiratory Equipment & Supplies, Vaughan - Oxygen Concentrator, Tank, Machine, etc
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