- Games & Hobbies, Ottawa
- Garage Doors & Door Operating Devices, Ottawa
- Garage Doors & Gates, Ottawa - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Ottawa
- Garbage & Rubbish Removal, Ottawa
- Garment & Linen Services, Ottawa
- Gas & Air Compressors, Ottawa
- Gas Companies, Ottawa
- Gas Equipment Industrial, Ottawa
- Gas Station, Ottawa - Service & Filling Station
- Gemologists & Jewelers, Ottawa
- General Business Services, Ottawa
- General Merchandise Stores, Ottawa
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- General Travel Agents & Agencies, Ottawa
- Generators, Compressors, Pumps, Motors & Fans, Ottawa
- Genetics Specialists, Ottawa - Doctors, Physicians & Surgeons
- Geothermal Heating & Cooling Contractors, Ottawa - Geothermal HVAC - Installation
- Gifts, Cards & Stationery Stores, Ottawa
- Glass & Glass Products, Ottawa
- Glass - Auto, Float, Plate, Window & Doors, Ottawa
- Government, Ottawa
- Grease Traps, Ottawa
- Grocery Stores & Supermarkets, Ottawa
- Ground Transportation, Except Passenger, Ottawa
- Gun Repair & Services, Ottawa
- Guns & Gunsmith Services, Ottawa
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