- Nail Salons, Ottawa
- Nanny Services, Ottawa
- National Government, Ottawa
- Natural & Holistic Products, Ottawa
- Natural Gas Appliances & Equipment, Ottawa
- Natural Resource Attorneys & Lawyers, Ottawa
- Natural Resource Lawyers & Attorneys, Ottawa
- Natural Stone, Ottawa - Suppliers & Wholesalers
- Naturalizer Shoes, Ottawa
- Naturopathic Alternative Medicine, Ottawa
- Naturopathic Doctors, Ottawa - Naturopathic Medicine Physicians
- Naturopathic Practitioners, Ottawa
- Network Communications, Ottawa
- Network Designers, Ottawa - Computer Networking Design & Systems
- Neurologists, Ottawa - Neurology Doctors, Physicians & Surgeons
- Neuropsychological Testing, Ottawa
- News Service, Ottawa - News Syndicates
- Newspaper Manufacturers, Ottawa
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- Night Clubs, Ottawa - Nightclub & Night Life
- Non Ceramic Tile, Ottawa - Wholesale, Manufacturers & Suppliers
- Non Durable Goods & Products, Ottawa
- Non Prescription Medicine, Ottawa
- Non-Denominational Churches, Ottawa
- Noncommercial Social Research Organization, Ottawa
- Nonmetallic Mineral Services, Ottawa
- Nonresidential Building Operators, Ottawa
- North American Restaurants, Ottawa
- Notary Public, Ottawa
- Novelty, Souvenir & Gift Shops, Ottawa
- Nuclear Medicine Doctors, Ottawa - Physicians & Surgeons
- Nurseries & Garden Centers, Ottawa
- Nurses, Ottawa
- Nursing Homes, Ottawa - Skilled Nursing Facility - Personal Care Centers
- Nutrition Centers, Ottawa - Nutrition Specialists
- Nutritionists & Nutrition Consultants, Ottawa - Nutrition Centers
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