- Labor Organizations, Welland
- Labor Unions, Welland
- Laboratories Medical, Welland
- Lacquers Manufacturers, Welland
- Land Surveyor, Welland - Land Surveying Services
- Landscape Contractors & Designers, Welland
- Landscaping, Welland
- Landscaping Materials & Supplies, Welland
- Laser Therapy Clinics, Welland
- Laundromats & Dry-Cleaning, Coin-Operated, Welland
- Lawn & Garden Equipment & Supplies, Welland
- Lawn & Garden Services, Welland
- Lawn & Garden Sprinkler Systems, Welland
- Lawn Maintenance Services, Welland
- Lawn Mowers & Power Equipment, Welland
- Lawyers & Attorneys, Welland
- Leather Goods Cleaners & Dyers, Welland
- Legal & Tax Services, Welland
- Legal Professionals, Welland
- Libraries, Welland
- License & Registry Services, Welland
- Life Insurance, Welland
- Lift Trucks, Welland
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- Lighting Fixtures & Equipment, Welland
- Linen Supply Services, Welland
- Linens, Welland
- Lingerie & Underwear for Women, Welland - Bras, Panties, Bustiers, Corsets & More
- Liquor Stores, Welland
- Live Theaters, Welland
- Livestock, Welland
- Loans Personal, Welland
- Local & Short Haul Trucking Companies, Welland
- Locks, Welland
- Locksmiths, Welland - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Welland
- Lodging, Welland
- Lodging Services, Welland
- Long Haul Trucking Companies, Welland
- Lottery Game Retailers, Welland
- Luggage & Accessories , Welland
- Lumber & Lumber Products, Welland
- Lumber & Lumber Products, Welland
- Lumber & Wood Products Manufacturers, Welland
- Lumber Companies, Welland - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Welland
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