- Tattooing, Williamsville
- Tax Return Preparation, Williamsville
- Tax Services, Williamsville
- Telecommunications, Williamsville
- Temp Agencies, Williamsville
- Temporary & Contractor Agencies, Williamsville
- Tennis Equipment & Supplies Stores, Williamsville - Racquets, Shoes, Balls, Bags, Clothing & Accessories
- Theater & Sport Ticket Agencies, Williamsville
- Thrift Stores, Resale & Consignment Shops, Williamsville
- Tire Retread, Regroove & Repair Equipment, Williamsville
- Tires - Wholesale & Retail, Williamsville
- Title & Surety Insurance, Williamsville
- Tobacco Products, Williamsville
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- Tools & Hardware Supplies, Williamsville
- Tourist Attractions, Williamsville
- Tours & Guide Services, Williamsville
- Towing Service, Williamsville
- Toy Stores, Williamsville
- Transportation, Williamsville
- Transportation & Traffic Consultants & Services, Williamsville - Transportation Brokers & Consultants
- Transportation Rental & Leasing, Williamsville
- Travel & Tourism, Williamsville
- Travel Arrangement & Services, Williamsville
- Truck Rental & Leasing, Williamsville - Rent a Truck & Tractor
- Tutoring Instructor, Williamsville
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