- Obstetricians & Gynecologists, Guelph - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Guelph
- Occupational Health Care Physicians & Surgeons, Guelph - Occupational Medicine
- Occupational Health Care Professionals, Guelph
- Occupational Therapy, Guelph - Occupational Health Specialists
- Office & Meeting Equipment & Supplies Rental, Guelph
- Office Furniture & Equipment Rental & Leasing, Guelph
- Office Supplies, Equipment & Office Furniture Stores, Guelph
- Oil & Gas Companies, Guelph
- Oil & Petroleum Products, Guelph - Merchant, Wholesalers, etc
- Oil And Petroleum Products, Guelph
- Oil Change & Lubrication, Guelph - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Guelph
- Opticians, Guelph
- Optometrists, Guelph - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Guelph - Eye Clinics
- Organizing Services & Products – Household & Business, Guelph
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- Ornamental Nursery, Guelph
- Ornamental Nursery Consultants, Guelph
- Ornamental Nursery Products, Guelph
- Ornamental Nursery Services, Guelph
- Orthodontist, Guelph - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Guelph - Orthopedic Shoes
- Orthopedic Appliances, Guelph
- Other Building Materials & Supplies, Guelph
- Outdoor Advertising & Billboard, Guelph
- Outdoor Equipment & Accessories, Guelph
- Outdoor Furniture, Guelph
- Outerwear & Accessories Manufacturers, Guelph
- Outerwear Stores, Guelph - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Guelph - Outpatient Care
- Overhead Door, Guelph
- Oxygen & Respiratory Equipment & Supplies, Guelph - Oxygen Concentrator, Tank, Machine, etc
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