- Hair Coloring
- Hair Extensions
- Hair Styling
- Haircare Products Retail
- Harbor Towing and Barge Transportation Services
- Hardscaping Design and Installation
- Hardware and fastener suppliers
- Hardwood Flooring Manufacturing
- Hardwood Lumber Production
- Harvesting of Non-perennial Crops
- Harvesting and Packaging of Vegetables and Plants
- Hatchery Management
- Hauling Services
- Hazardous Waste Handling and Disposal
- Health and Wellness Classes
- Health care
- Health Insurance
- Health/Medical Coverage
- Health Stores
- Healthcare Market Research
- Healthcare Technology Developers
- Heat Recovery Solutions
- Heat Treating and Hardening of Metals
- Heating and Air Conditioning (HVAC) Systems Repair
- Heavy and Civil Engineering Construction
- Heavy Equipment Operation
- Heavy Freight Delivery Services
- Heavy Load Haulage
- Heavy Machinery Repair and Installation
- Hedge fund management activities
- Hedge funds
- Hedge Funds and Private Equity Funds Management Services
- Helicopter transport services
- Hematology & Oncology Infectious Disease Treatment Nephrology & Urology Neurology Ophthalmology
- Herbal Supplements
- High Frequency Trading (HFT)
- High-Rise Window Cleaning Services
- High Schools
- High-Speed Rail Transport
- High Voltage Cable Testing and Certification
- High Volume Digital Finishing Services
- Highway and Road Construction
- Highway Construction
- Hiking and Trekking Services
- Historical Preservation
- Historical Tours
- History Museums
- History Research and Development
- Holiday parks
- Holiday resorts
- Home Appliance Retail
- Home Audio and Video Equipment Retailers
- Home-Based Education
- Home Cooking Services
- Home Decor Agents
- Home décor and furniture retail online
- Home Decor Retailers
- Home Furnishing Retails
- Home furnishing stores
- Home Furnishings and Decor Sales
- Home Goods Retail
- Home Health Care Agencies
- Home Health Care Visits
- Home Improvement and Hardware Stores
- Home Office Furniture Manufacturing
- Home pickup and delivery of laundry and dry cleaning services
- Home Shopping Networks
- Home Staging Services
- Home tutoring
- Homeopathic Remedies Dispensing Chemists
- Horizontal Drilling
- Horse Feed Manufacturing
- Horse grooming and training services
- Horse racing, greyhound racing and track operations
- Horse Showing and Competitions
- Horse Transport Services
- Hospice and Palliative Care Services
- Hospital Cafeteria Catering
- Hospital Canteens
- Hospital Laundry and Linen Services
- Hospitality recruitment services
- Hospitals
- Hostel Management Software
- Hostels
- Hotels
- Hotels with Restaurants
- Hotels without Restaurants
- Houseboat Rental
- Houseboat Renting
- Household Cleaning Product Manufacturing
- Housekeeping Activities
- Housewares Agents
- HR Information Systems (HRIS) Implementation and Maintenance
- Human Resources Administration
- Human Resources Consulting
- Human Resources Management Consulting
- Human Resources Management Services
- Humanitarian Aid and Relief Organisations
- Humanities Research and Development
- Hunting and Trapping
- Hunting Apparel
- Hunting Equipment
- Hunting Supplies
- Hydraulic Equipment Agents
- Hydraulic Motor Repair