- Tank & Pipe Working Industrial Equipment, Ottawa
- Tanning Salons, Ottawa
- Tax Return Preparation, Ottawa
- Tax Services, Ottawa
- Telecommunications, Ottawa
- Telecommunications Companies, Businesses & Services, Ottawa
- Telephone Communication Service & Phone Companies, Ottawa - Local & Long Distance Telephone Service
- Telephone Equipment & Systems - Repair & Service, Ottawa - Telecommunication Services
- Theater & Sport Ticket Agencies, Ottawa
- Thrift Stores, Resale & Consignment Shops, Ottawa
- Tire Retread, Regroove & Repair Equipment, Ottawa
- Tires - Wholesale & Retail, Ottawa
- Title & Surety Insurance, Ottawa
- Title Companies, Ottawa - Title Search, Service & Abstract Company
- Tools & Hardware Supplies, Ottawa
- Towing Service, Ottawa
- Toy Stores, Ottawa
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- Tractors Equipment & Supplies, Ottawa
- Trailer Parts & Equipment, Ottawa
- Trailer Rental & Leasing, Ottawa
- Transmission Repair & Service, Ottawa
- Transportation, Ottawa
- Transportation Equipment And Supplies - Except Motor Vehicle, Ottawa
- Transportation Equipment Manufacturers, Ottawa
- Transportation Facilities & Services, Ottawa
- Transportation Rental & Leasing, Ottawa
- Travel & Tourism, Ottawa
- Travel Arrangement & Services, Ottawa
- Trenching Contractors, Ottawa - Trencher - Excavation Contractors
- Truck Rental & Leasing, Ottawa - Rent a Truck & Tractor
- Truck Repair & Service, Ottawa
- Truck Stops, Ottawa
- Truck Trailers Renting & Leasing, Ottawa
- Trucking - Garbage, Refuse, Waste, Trash, Scrap & Junk Removal, Ottawa - Collection, Removal, Disposal, Recycling, etc
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