- Obstetricians & Gynecologists, Ottawa - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Ottawa
- Occupational Health Care Professionals, Ottawa
- Occupational Therapy, Ottawa - Occupational Health Specialists
- Office & Meeting Equipment & Supplies Rental, Ottawa
- Office Buildings & Parks, Ottawa
- Office Furniture & Equipment Rental & Leasing, Ottawa
- Office Partitions & Dividers, Ottawa
- Office Planning & Design, Ottawa
- Office Space on Rent, Ottawa - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Ottawa
- Office Wall Units, Ottawa
- Oil & Gas Companies, Ottawa
- Oil & Gas Exploration & Development, Ottawa - Oil Field Exploration, Monitoring & Remediation
- Oil & Petroleum Products, Ottawa - Merchant, Wholesalers, etc
- Oil And Petroleum Products, Ottawa
- Oil Change & Lubrication, Ottawa - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Ottawa - Oil Companies
- Oils & Greases, Ottawa
- Ophthalmologists, Ottawa - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Ottawa
- Opticians, Ottawa
- Optometrists, Ottawa - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Ottawa - Eye Clinics
- Oral Surgeon, Ottawa - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Ottawa
- Organizing Services & Products – Household & Business, Ottawa
- Organs Tuning & Repair, Ottawa
- Oriental Food Products, Ottawa
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- Oriental Goods & Products Stores, Ottawa
- Oriental Restaurants, Ottawa
- Oriental Rugs, Ottawa
- Ornamental Greenhouses, Ottawa
- Ornamental Nursery, Ottawa
- Ornamental Nursery Services, Ottawa
- Orthodontist, Ottawa - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Ottawa
- Orthopedic & Prosthetic Appliances & Shoes, Ottawa - Orthopedic Shoes
- Orthopedic Appliances, Ottawa
- Orthopedists, Ottawa - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Ottawa
- Other Attorneys & Lawyers, Ottawa
- Other Building Materials & Supplies, Ottawa
- Other Lawyers & Attorneys, Ottawa
- Other Lodging, Ottawa
- Other Office Supply Stores, Ottawa
- Outboard Motors, Ottawa
- Outdoor Advertising & Billboard, Ottawa
- Outdoor Equipment & Accessories, Ottawa
- Outdoor Furniture, Ottawa
- Outerwear Stores, Ottawa - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Ottawa - Outpatient Care
- Outplacement Consultants, Ottawa
- Outplacement Counseling, Ottawa
- Outsourcing Services, Ottawa
- Overhead Door, Ottawa
- Oxygen & Respiratory Equipment & Supplies, Ottawa - Oxygen Concentrator, Tank, Machine, etc
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