- Obstetricians & Gynecologists, Halifax - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Halifax
- Occupational Health Care Professionals, Halifax
- Occupational Therapy, Halifax - Occupational Health Specialists
- Oceanographic Services, Halifax
- Office & Meeting Equipment & Supplies Rental, Halifax
- Office Buildings & Parks, Halifax
- Office Furniture & Equipment Rental & Leasing, Halifax
- Office Space on Rent, Halifax - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Halifax
- Offshore Platforms, Halifax
- Oil & Gas Companies, Halifax
- Oil & Gas Exploration & Development, Halifax - Oil Field Exploration, Monitoring & Remediation
- Oil & Petroleum Products, Halifax - Merchant, Wholesalers, etc
- Oil & Petroleum Retail, Halifax
- Oil Change & Lubrication, Halifax - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Halifax - Oil Companies
- Oncologists, Halifax - Cancer Doctors, Physicians & Surgeons (Oncology)
- Opera Companies, Halifax
- Ophthalmologists, Halifax - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Halifax
- Opticians, Halifax
- Optometrists, Halifax - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Halifax - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Halifax
- Organizing Services & Products – Household & Business, Halifax
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- Oriental Goods & Products Stores, Halifax
- Ornamental Iron - Residential, Halifax - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Metal Work, Halifax - Steel, Iron, Bronze, etc
- Ornamental Nursery, Halifax
- Ornamental Nursery Products, Halifax
- Ornamental Nursery Services, Halifax
- Orthodontist, Halifax - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Halifax
- Orthopedic & Prosthetic Appliances & Shoes, Halifax - Orthopedic Shoes
- Orthopedic Appliances, Halifax
- Orthopedists, Halifax - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Halifax
- Other Attorneys & Lawyers, Halifax
- Other Building Materials & Supplies, Halifax
- Other Electrical Products, Halifax
- Other Industrial Contractors, Halifax
- Other Lawyers & Attorneys, Halifax
- Other Lodging, Halifax
- Other Office Supply Stores, Halifax
- Outdoor & Lawn & Garden Equipment Repair & Service, Halifax
- Outdoor Equipment & Accessories, Halifax
- Outerwear Stores, Halifax - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outsourcing Services, Halifax
- Overhead Door, Halifax
- Oxygen & Respiratory Equipment & Supplies, Halifax - Oxygen Concentrator, Tank, Machine, etc
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