| Gryphtech | |
| Grytech IT Group | Ontario |
| GS Web Technologies | |
| GS/C Communication Intervox, Inc. | Quebec |
| GS1 Canada | Ontario |
| GSA Computer Solutions | Ontario |
| GSITech | |
| gskinner | Alberta |
| GSM Project | |
| GSR Informatique, Inc. | |
| GST, Inc. | Quebec |
| GSTS | |
| GT Global Services, Inc. | Ontario |
| GTA Network Consulting | Ontario |
| GTA Web Developers | Ontario |
| GTD Telecommuniations, Inc. | Ontario |
| Gtechna, Inc. | Quebec |
| GTI Canada, Inc. | Quebec |
| GTmetrix | British Columbia |
| GTO Gestion Informatique | Quebec |
| GTR Data, Inc. | Quebec |
| Guarana | Quebec |
| Guarana Design Graphique | Quebec |
| Guaranteed Removals | |
| Guaranteed SEO | British Columbia |
| Guardian EMR | |
| Guardian Mobility | Ontario |
| Guardian Telecom, Inc. | Alberta |
| GuentherTech | Ontario |
| Guépard Communications | Quebec |
| Guérilla Web | Quebec |
| GuestTek | Alberta |
| Guich Informatique | |
| Guide Analytics | |
| Guild Solutions | |
| GuildOne | Alberta |
| Gulfstream Computer Services | Manitoba |
| Guru SEO and Web Design Services | |
| Guru's Cell Phone Repairs | |
| GuruLink, Inc. | Ontario |
| Gurus Solutions | Quebec |
| Gustav | |
| Gustin Quon | |
| GutWire Audio Cables | Ontario |
| Guy Software | British Columbia |
| GVE Global Vision, Inc. | Quebec |
| GVI Clinical Development Solutions | Manitoba |
| GWA Business Solutions, Inc. | Ontario |
| GWD Computer Systems | Ontario |
| GWN Technologies | Alberta |