- Hair Care Professionals, Ottawa
- Hallmark Gift Shop, Ottawa
- Hardware Stores, Ottawa
- Head Start Centers, Ottawa
- Health & Diet Food Products - Wholesale & Retail, Ottawa
- Health & Medical, Ottawa
- Health And Medical Centers, Ottawa
- Health Care Plans, Ottawa
- Health Clubs & Gymnasiums, Ottawa
- Health Insurance, Ottawa
- Healthcare Providers, Practitioners & Professionals, Ottawa
- Hearing Aids & Assistive Devices & Supplies, Ottawa - Hearing Devices
- Heating & Air Conditioning Equipment, Parts & Supplies, Ottawa - HVAC Suppliers & Companies
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- 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
- Heating Contractors, Ottawa - Heating Systems - Installation & Repair
- Heavy Haul Trucking Companies, Ottawa - Heavy Equipment & Machinery Hauling & Transportation
- Home Additions & Remodeling Contractors, Ottawa - Refinishing & Restoration
- Home Health Care, Ottawa - Agencies & Services
- Hospices, Ottawa - Hospice Services
- Hospitals, Ottawa
- Hotels & Motels, Ottawa
- Household & Commercial Appliances Stores, Ottawa
- Household Goods & Furniture Storage , Ottawa
- Housing Authority, Ottawa
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