- Laboratories Medical, Petawawa
- Landscape Contractors & Designers, Petawawa
- Landscaping, Petawawa
- Laundromats & Dry-Cleaning, Coin-Operated, Petawawa
- Lawn & Garden Equipment & Supplies, Petawawa
- Lawn & Garden Services, Petawawa
- Lawn & Garden Sprinkler Systems, Petawawa
- Lawn Maintenance Services, Petawawa
- Lawyers & Attorneys, Petawawa
- Legal Professionals, Petawawa
- Libraries, Petawawa
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- Lighting Consultants, Petawawa
- Lighting Contractors, Petawawa
- Liquor Stores, Petawawa
- Loans Personal, Petawawa
- Lodging, Petawawa
- Long Haul Trucking Companies, Petawawa
- Lumber & Wood Products Manufacturers, Petawawa
- Lumber Brokers, Petawawa
- Lumber Companies, Petawawa - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Petawawa
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