- Gambling & Lottery Services, Guelph
- Games & Hobbies, Guelph
- Garage Doors & Door Operating Devices, Guelph
- Garage Doors & Gates, Guelph - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Guelph
- Garbage & Rubbish Removal, Guelph
- Garment & Linen Services, Guelph
- Gas & Other Services Combined, Guelph
- Gas Appliance Repair, Maintenance & Service, Guelph
- Gas Companies, Guelph
- Gas Engine, Guelph
- Gas Line Installation Contractors, Guelph - Gas Pipe Installation - Repair Service
- Gas Pipe, Guelph
- Gas Station, Guelph - Service & Filling Station
- Gauges, Guelph
- Gauges & Gages, Guelph
- Gay & Lesbian Service Organizations, Guelph
- Gemologists & Jewelers, Guelph
- General Business Consulting, Guelph
- General Business Services, Guelph
- General Consultants, Guelph
- General Freight Trucking, Guelph - Motor Freight
- General Hardware Stores, Guelph
- General Management Consulting Services, Guelph - Management Consultants
- General Merchandise Stores, Guelph
- General Travel Agents & Agencies, Guelph
- Generators, Compressors, Pumps, Motors & Fans, Guelph
- Geosynthetics, Guelph
- Geothermal Heating & Cooling Contractors, Guelph - Geothermal HVAC - Installation
- Gift Baskets, Guelph
- Gift Shops, Guelph - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Guelph
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- Gifts Wholesale & Retail, Guelph
- Gifts, Cards & Stationery Stores, Guelph
- Glass & Fiber Glass Materials, Guelph - Wholesale, Manufacturers & Suppliers
- Glass & Glass Products, Guelph
- Glass & Glazing Contractors, Guelph
- Glass - Auto, Float, Plate, Window & Doors, Guelph
- Glass Stained & Leaded, Guelph
- Glass Tinting & Coating, Guelph - Home - Car Window Tinting
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Guelph
- Golf Clubs Private, Guelph
- Golf Course Architect, Guelph
- Golf Course Architects, Guelph
- Golf Courses, Guelph
- Golf Driving Ranges, Guelph
- Golf Equipment & Supplies Stores, Guelph - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Gospel Church, Guelph
- Gourmet Food Stores, Guelph
- Gourmet Restaurants, Guelph
- Government, Guelph
- Graffiti Removal & Protection Services, Guelph
- Granite, Guelph
- Graphic Design Services, Guelph - Graphic Designer
- Graphic Designer & Artist Services, Guelph
- Greek Restaurants, Guelph
- Greeting Card Stores, Guelph
- Grinding Services, Guelph
- Grocery Stores & Supermarkets, Guelph
- Ground Transportation, Except Passenger, Guelph
- Guide & Directory Advertising Services, Guelph
- Gutter & Flashing Contractors, Guelph - Metal - Copper Flashing - Gutter Cleaning & Repair Services
- Gymnastic Clubs, Guelph
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