- Hair Care Professionals, Ottawa
- Halls, Auditoriums & Ballrooms Rental, Ottawa
- Hamburger & Hot Dog Stands, Ottawa
- Hamburger Restaurants, Ottawa
- Hardware Stores, Ottawa
- Hauling And Shipping, Ottawa
- Health & Fitness Program Consultants & Trainers, Ottawa
- Health & Medical, Ottawa
- Health And Medical Centers, Ottawa
- Health Care Information & Services, Ottawa
- Health Clubs & Gymnasiums, Ottawa
- Health Insurance, Ottawa
- Healthcare Consultants, Ottawa
- Healthcare Providers, Practitioners & Professionals, Ottawa
- Hearing Aid Repair, Ottawa - Hearing Devices
- Hearing Aids & Assistive Devices & Supplies, Ottawa - Hearing Devices
- Heating & Air Conditioning Equipment, Parts & Supplies, Ottawa - HVAC Suppliers & Companies
- Heating & Air Conditioning Repair, Installation & Service Contractors, Ottawa - HVAC Contractors
- Heating & Air-Conditioning Contractors, Ottawa - HVAC Contractors - Installation, Repair, Replace Service, etc
- Heating & Plumbing Supplies Stores, Ottawa
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- Heating Contractors, Ottawa - Heating Systems - Installation & Repair
- Historical Organizations, Ottawa
- Historical Preservation & Restoration Services, Ottawa
- Historical Societies, Ottawa
- Home & Consumer Electronics & Appliances Rental, Ottawa
- Home & Garden Products, Ottawa
- Home Additions & Remodeling Contractors, Ottawa - Refinishing & Restoration
- Home Appliance Repair, Sales & Services, Ottawa
- Home Furnishings, Ottawa - Home Decor Stores, Items & Accessories
- Home Health Care, Ottawa - Agencies & Services
- Homeowners Insurance, Ottawa
- Hospices, Ottawa - Hospice Services
- Hospitals, Ottawa
- Hot Dog Restaurants, Ottawa
- Hotel Motel & Resort Reservations, Ottawa
- Hotels & Motels, Ottawa
- Household & Commercial Appliances Stores, Ottawa
- Household Goods & Furniture Storage , Ottawa
- Humane Societies, Ottawa
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