| GAO RFID, Inc. | Ontario |
| Garage Capital | Ontario |
| Garden Isle Computing 2005, Inc. | Prince Edward Island |
| Gargoyle Communications | Ontario |
| Garner | Ontario |
| Garnet | British Columbia |
| Garvin-Allen | Nova Scotia |
| Gary Eikenberry Consulting | Ontario |
| Gary Hyman | Ontario |
| Gasket Games Corporation | |
| Gaslamp Village Web Design Studio | Alberta |
| GASMAN | British Columbia |
| Gastops Ltd | |
| Gastown Webspace, Inc. | British Columbia |
| GateFive Consulting | |
| Gateway Computers | Ontario |
| Gateway Marketing, Inc. | Ontario |
| Gateway Visual Communications, Inc. | Ontario |
| GateWest | Manitoba |
| Gauthier Business Technologies | |
| GAWD Productions | Ontario |
| Gazelle.ai | Quebec |
| Gazoo Mobile | Ontario |
| GB Micro Electronics | Quebec |
| GBatteries | |
| GBGrafik | Quebec |
| GBI Experts-Conseils, Inc. | |
| GBIT Logistics, Inc. | British Columbia |
| GBL | |
| GBS Technologies | Nova Scotia |
| GBS, Inc. | British Columbia |
| GC Brieau | |
| GC Brieau, Inc. | Quebec |
| GC4 Tech | |
| GCI Canada | Ontario |
| GCI Catpial | |
| GCI MAG | |
| GCL Communications Solutions | Ontario |
| GCME Informatique | Quebec |
| GCS Informatique | Quebec |
| GCS Technology Services, Inc. | British Columbia |
| GDAC-LIA | Quebec |
| GDG Android Montréal | Quebec |
| GDG Informatique et Gestion | Quebec |
| GDI, Inc. | Quebec |
| GE Aérospatial | |
| Géant du web | Quebec |
| Gecko Web & Development | Ontario |
| Gecko Websites | Ontario |
| Geebo Device Repair | |