- Games & Hobbies, Ontario
- Garage, Door & Window Products, Ontario
- Garden & Lawn Sprinklers Systems – Equipment, Parts & Supplies, Ontario
- Garment & Linen Services, Ontario
- Gas Companies, Ontario
- Gas Engine, Ontario
- Gas Equipment Industrial, Ontario
- Gas Station, Ontario - Service & Filling Station
- Gasoline, Ontario
- General Business Services, Ontario
- General Freight Trucking, Ontario - Motor Freight
- General Hardware Stores, Ontario
- General Merchandise Stores, Ontario
- General Surgeons, Ontario - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Ontario
- Generators, Compressors, Pumps, Motors & Fans, Ontario
- Geotechnical Engineer, Ontario
- Geotechnical Soils Engineer, Ontario
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- Gifts, Cards & Stationery Stores, Ontario
- Glass & Glass Products, Ontario
- Glass & Glazing Contractors, Ontario
- Glass - Auto, Float, Plate, Window & Doors, Ontario
- Glass Tinting & Coating, Ontario - Home - Car Window Tinting
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Ontario
- Golf Courses, Ontario
- Government, Ontario
- Grain Elevators, Ontario
- Graphic Design Services, Ontario - Graphic Designer
- Graphic Designer & Artist Services, Ontario
- Grease Traps & Sand Traps Service, Ontario
- Grocery Stores & Supermarkets, Ontario
- Ground Transportation, Except Passenger, Ontario
- Gun Repair & Services, Ontario
- Guns & Gunsmith Services, Ontario
- Gymnastics Schools, Ontario
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