| Isosceles | British Columbia |
| iSource Design | Manitoba |
| IsoVision | Quebec |
| IsoVision, Inc. | |
| ISP Computers Ltd | Alberta |
| iSP3 Solution Providers, Inc. | |
| ISPAC Solutions, Inc. | Ontario |
| iSpire | |
| ISQ Téléphonie, Inc. | Quebec |
| ISQ Webhosting, Inc. | Ontario |
| iSquared Software, Inc. | Quebec |
| ISR, Inc. | |
| ISTCL | Ontario |
| iSTEDY.com | |
| iSTORM | Ontario |
| ISU Corporation | Ontario |
| ISW Communications | Ontario |
| ISW Technologies | |
| iSys - The Imaging Systems Group, Inc. | Alberta |
| IT Atlant | |
| iT Blueprint | |
| IT Chapter, Inc. | Quebec |
| IT Cloud Solutions | Quebec |
| IT Collaborative, Inc. | Ontario |
| IT Computing Resources, Inc. | Ontario |
| IT Connect Business Solutions | |
| IT Conquest | |
| iT Core Canada | Alberta |
| IT Directorship | |
| IT Era Solutions Services | |
| IT Essentials | Nova Scotia |
| IT Experts | Ontario |
| IT eXpress | British Columbia |
| IT Finance Canada | |
| IT Génération, Inc. | Quebec |
| IT Glue | |
| IT Guy Technologies | |
| IT Horizons | Alberta |
| IT International Telecom, Inc. | Quebec |
| IT Partners | Alberta |
| IT Patrol | Ontario |
| IT Real Simple | Nova Scotia |
| IT Refresh Computer Technology | Ontario |
| IT Service | |
| IT Services | British Columbia |
| IT Shark Studio | |
| IT Solutions Plus | Ontario |
| IT Step | |
| IT Support Experts | |
| IT Unlock Consulting, Inc. | Quebec |