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